A natural-finished guitar preserves the wood's original appearance with minimal staining or coating, enhancing its natural grain and resonance. Discover the recommended kit and products for this finish: Natural Guitar Finish - Tru Oil Full Set

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Please take a moment to carefully review these instructions. They provide a clear overview of the process and help you avoid common mistakes. For a deeper understanding, be sure to explore the other building and painting guides available in our blog section, which offer valuable tips and techniques to enhance your project.

PREPARATION

Before Starting

• Always be very careful with your body and your sleeves. It’s easy to cause a bump, scratch, or drop of polish. Don’t rush.

• Make sure your environment is always clean. A common issue is applying stain or varnish in a dusty setting, which results in an imperfect finish.

• Don’t varnish the fingerboard unless you know this is your preference. Normally, we apply nothing or just a little lemon or mineral oil (for Rosewood or Ebony) to maintain a comfortable feel.

Useful Products Available on The Guitar Fabrik

Only the strictly necessary tools are listed here. However, you can always enhance your result using additional tools and adjustments. These require experience in lutherie and are not covered here.

Sand Paper	A range of sandpapers, P240, P400, P600, P800, P1000, & P1200, for sanding and polishing. Use them throughout the finishing process, especially for initial sanding and final polishing.
Copper Tape	Recommended: The adhesive copper tape will prevents electromagnetic interference from pickups and improves sound quality.
Sanding Block	Recommended: A 240-grit sanding block will be used in both during the early sanding and during the final polishing stages. Attach different grit papers to suit your different needs.
Gloves	A pair (or two) of rubber gloves to protect your hands during some finishing stages.
Painting Brush	Optional: A wide brush will make the applying of a grain fille, a dye or a varnish evenly, easier.
Cloth	Optional: It will be used for applying a dye, a Tru-Oil finish, a polishing product or to clean & wipe your guitar neck and body. A microfiber cloth is recommended.
Masking Tape	It will be used to protect areas like the fretboard or bindings that shouldn’t be painted or sanded.
Plastic Card	Optional: Useful for smoothly and evenly applying th grain filler.
Vacuum or Air Spray	Optional: Useful during sanding to remove dust and keep the workspace clean.
Fan	Recommended: For dry sanding during the final polishing phase.

With the natural finish kit, here is the list of tools and consumables you will receive:

OVERVIEW OF THE FINISHING STEPS

Here are the steps to follow to achieve the expected finish using your kit:

• Working environment
• Wood preparation + sublime effect preparation
• Grain filling application
• Staining of the wood
• Varnishing
• Polishing (optional)

The different methods and practices defined in this guide have been extensively tested. Strictly following the instructions in these instructions for use will lead to the expected results. Although it is possible to do some things differently. This method has been implemented to make it as easy as possible for the user to undertake the finishing of his guitar and to obtain a professional result as desired and at a lower cost.

WORKING ENVIRONMENT

To get a clean and professional finish on your guitar, it's essential to prepare your workspace and tools properly before starting. Here’s how to set up your painting environment.

Choose a stable indoor space:

• Work indoors in a clean, dust-free and well-ventilated room.
• Avoid outdoor areas to prevent contamination from wind, insects or humidity.
• Let the guitar wood rest in this space for 48 hours before finishing to adjust to temperature and humidity.

Prepare how you'll hold the parts:

• Hang the body and neck using screws or hooks through strap button or tuner holes.
• For spraying, fix a stick into the neck pocket to hold the body safely while working.
• For sanding and manual staining, lay parts flat on padded surfaces like foam or cushions.

You can also fix the body to a piece of wood. This allows you to hold it in your hand when finishing with a spray or to put it in a clamp :

Plan your workflow:

• Decide where each step will take place: staining, spraying, drying, etc.
• Allow enough space for parts to dry between coats, without touching anything.
• Expect the full finishing process to take from one to four weeks depending on the products used.

Check your materials:

• Make sure you have all the tools and products listed in your finishing kit.
• Read through all steps and instructions before starting to avoid surprises mid-process.

WOOD PREPARATION

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Glue Stain

Before starting the finish, take a close look at your guitar body. If you notice any glue stains, remove them gently by hand-sanding with P240 to P400 grit sandpaper. Sand gradually and evenly, checking your progress regularly — the goal is to eliminate the stains while removing as little wood as possible. Also take this time to inspect the entire surface for any dents, scratches, or rough areas. Smooth them out with light sanding if necessary, as these imperfections may become more visible once the finish is applied. Finally, make sure all the contours and edges of the body are clean and well-defined, especially around routed areas, cavities, or binding. A clean surface is essential for an even grain-raising step and a flawless final result.

Raising the Grain (optional)

This step is optional but recommended for mahogany or ash when using water-based products — especially with our translucent kits. It helps achieve a smoother finish and reduces paint consumption, particularly with nitrocellulose or opaque polyurethane finishes. Skipping it won’t ruin your result, but it may slightly affect the final texture.

When water or water-based products contact bare wood, the fibers swell — this is called “grain raising”. Once dry, the surface feels rough. Since this effect is unavoidable with water-based finishes, it's best to control it before applying your stain or sealer.

To do this, dampen the wood evenly with a sponge or cloth and let it dry completely (ideally overnight, or at least 4–5 hours in warm, dry air). Then sand lightly with P240 grit paper — just enough to smooth the raised fibers without going too deep. Worn or slightly dull sandpaper works well for this purpose.

If the surface still feels rough, repeat the process with a second round of wetting and sanding, this time using finer grit like P400 for an even smoother base.

Sanding the Instrument

The purpose of sanding is to create an ideal surface for finishing and to do this we need to create a smooth surface, remove imperfections and machine marks that affect your finish. Note that your body and handle have been pre-sanded with grit P180.

First, here are some important rules to follow during the sanding step:

• Always sand in the direction of the grain (forwards and backwards with the grain) never on the side. For the sides and edge of the body it may be more difficult to sand in the direction of the grain in which case always sand in a direction that you have predefined.
• Sand first with a P240 grit, then P400 in the case of a stain. This step of smoothing wood with different grain levels is important. Each step P240 and P400 has its uses.
• Cavities that will not need to be painted since they will be covered by one of the components, pickguard pickups, etc. do not need to be sanded.
• Sand all flat faces and outlines well, and don't forget the hard-to-reach places. Then clean with a rag or with a fan to remove all dust and wood catfish.
• You should ALWAYS use a sanding block on the flat surfaces of your guitar (or a rotary sander if you have).
• When using the polishing pad or sandpaper clean it often. To do this pat and rub lightly on a rag surface to remove the dust embedded in your sandpaper. When the sandpaper becomes very worn, replace it.
• When sanding the edges of your guitar or delicate areas of the neck, remove the sanding block and simply slide the sandpaper between your fingers against the surface. It takes longer but will result in a better finish and allow you more control.
• When satisfied with your job, be sure to remove all sanding dust and grits with a vacuum, damp cloth.

Sanding by hand: This is a bit of a tedious but essential step and it is important to do it well to get a good result.

Sanding with a machine: If you have a rotary sander (excentric), don't hesitate - they'll make your life a lot easier. But take it easy!

Sanding the contours: A rotary sander is no longer appropriate here, as it can easily round off or damage the delicate curves and edges of your body. Switch to hand sanding with a soft block or flexible pad to maintain control and precision. Once your contours are smooth and consistent, you're ready to move on to the next step: applying the grain filler.

Tip: For sanding guitar edges and contours, flexible tools like a foam tip, rubber eraser, cork block, or even a thermal insulation sheath wrapped in sandpaper conform easily to curves, offering better control without flattening rounded areas. Mixing these lets you adapt quickly to different shapes while staying gentle on the wood.

APPLYING THE TRU-OIL: SEALER & FILLER

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General Information

Tru-Oil Sealer & Filler is a specially formulated base coat designed to both seal the wood and fill its pores, creating a smooth, professional foundation for your finish. It’s ideal for open-pore woods such as mahogany, ash, and walnut. Here's what it will help you achieve:

• A more even and efficient application of Tru-Oil finish.

• Reduced absorption of oil into the pores, saving product and enhancing shine.

• A silky-smooth final result, free from visible pores or pinholes.

• Better adhesion and longevity for your finish coats.

Note: This product is a clear sealer-filler, so it will not alter the color of your wood. If you wish to tint the body, do so before sealing or mix a compatible dye with the filler before application.

Preparation

Start by preparing your guitar body:

• Sand the wood progressively up to P320 grit. Avoid over-sanding which can burnish the surface and reduce absorption.

• Remove dust using a tack cloth or vacuum.

• Optionally, apply a wood dye for coloration before sealing. Let it dry completely before proceeding.

Optional Tip: Slightly warming the wood with a heat gun or in the sun can help open the pores before application.

Application

You can apply Tru-Oil Sealer & Filler with a clean, lint-free cloth, a foam brush, or even your fingers in gloves for better control. Follow these steps:

1. Shake the bottle well. Pour a small amount into a disposable container.

2. Apply in thin, even coats, working in circular motions to push the filler into the wood pores. Ensure full coverage of the body and neck (if desired).

3. Wait 5–10 minutes. While the product is still tacky, wipe off any excess with a clean cloth, following the grain direction. Avoid leaving heavy residue on the surface.

4. Allow to dry for **2–3 hours** (or overnight for best results) in a dust-free, well-ventilated area.

Sanding and Reapplication

Once dry:

• Lightly sand the surface with **P400–P600** grit sandpaper. Sand gently to avoid removing material from the pores.

• Inspect under angled light. If you still see open pores or dull areas, reapply the sealer in the same manner.

• Repeat as needed (1–3 coats is usually sufficient).

Finishing Touches

After the final sanding, you’ll have a smooth, filled surface ready to receive Tru-Oil finish coats.

• Make sure the surface is free from dust and grease before applying the oil finish.

• Apply Tru-Oil in extremely thin coats, allowing proper drying between applications.

• Buff between coats with fine synthetic wool or micromesh for a glassy finish.

Manage the bindings: Mask your bindings carefully during all application stages. Clean any overrun with a blade or micro-polisher after removing the tape. This ensures crisp, professional edges that highlight your craftsmanship.

TRU-OIL VARNISHING

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Buy Sheen & Conditioner

General Information

Although store-bought electric guitars are finished in polyurethane, we have chosen to propose a solution using Tru Oil. The reason is that it is easier to apply and almost non-toxic and provides better enhancement of the wood for translucent finishing. Please keep in mind the few comments below.

• Before starting the varnishing step, make sure your wood has been sanded with P800.
• It is important to apply thin coats as much as possible to achieve a smooth finish.
• Quite a lot of coats will be needed so I will say it is the step you might spend the most time on.
• Each time you add a coat it will adjust the coloration of the wood, I will say darker with a light tint of amber.
• Inspect your wood well after each coat to make sure it's all good.
• Remember that compared to other finishing products Tru Oil dries quickly.
• Use gloves.

Preparation

Before opening, we invite you to shake your Tru Oil bottle to make sure it is homogeneous. Make sure the guitar body is clean, dry, and free of dust or oils. Position the instrument on a stable, well-ventilated, and dust-free surface, as described in Section III. It's essential that the wood is properly sanded and, if desired, grain-filled. Take a moment to inspect the surface for any imperfections—once the finish is applied, they’ll become more visible. When everything is ready, you're set to begin the varnishing process.

Application

• Apply the coats of Tru Oil with a very clean cloth or a handkerchief in thin paper applying circular movement. Put a little each time and apply it as thin as possible, there should be no liquid residue on the surface of your wood.
• Apply a total of 4 to 6 coats with a couple of hours between coats. When done wait 2 days.
• Then sand it with a P1000 sanding paper.
• Then apply 2 new coats waiting 2 hrs between the coats. Wait 1 day and sand with P1200.
• Apply 4 last coats, wait 1 day and sand to P1500.
• Let it cure for around a week.

A basic rule is that if you can still smell the solvent, the finish is still curing. Let the piece cure. It will be worth it to have a strong finish for many years to come.

Take care of the binding of the guitar body (in the event that your body does indeed have bindings!): Your relief may be slightly colored with which case you just have to scrape it lightly using a cutter blade.

Note: this finishing kit does not include a final polish which is optional. In fact, even without it, you should already have obtained a very nice result. However, if you want more shine and an even smoother surface we invite you to undertake this final finishing step. Buffing can be divided into 3 steps, level sanding to remove the last defects, sanding for polishing and finally buffing. This will not be discussed further in this user guide.

TRU-OIL CONDITIONING

Now that the varnish has fully cured, the surface of the guitar may feel too glossy or slightly uneven. To achieve a professional, smooth, and natural finish, the next step is to refine and condition the surface.

A well-applied varnish protects your guitar, but achieving the perfect feel requires one last step. Stock Sheen & Conditioner helps smooth the surface, soften excessive gloss, and enhance the final look.

Preparation

Using Stock Sheen & Conditioner is a straightforward process, but patience and precision will yield the best results.

Before starting, ensure that:

• The varnish has dried for at least 24 to 48 hours (depending on humidity and temperature).
• The guitar is free from dust and fingerprints.
• ou have a soft, clean cloth (preferably microfiber or cotton) for application.

Application

• Shake the bottle well to evenly distribute the conditioning agents.
• Apply a small amount of conditioner to your cloth—do not apply directly to the guitar.
• Using light circular motions, gently rub the product onto the guitar's surface.
• Let the conditioner sit for about 5 minutes to allow absorption.
• Take a separate dry, clean cloth and buff the surface, using light pressure, until you achieve the desired sheen.
• If necessary, repeat the process for a smoother feel.

For best results, work in small sections and avoid excessive pressure. The goal is to subtly refine the finish, not remove the varnish layer.

Once complete, your guitar will have a smooth, refined finish that enhances both aesthetics and playability. The surface will feel more natural under your fingers while maintaining protection against wear and humidity.

POLISHING

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Buy Polishing Kit

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General Information

Polishing is optional, and normally, even without it, you should already have achieved a very nice result. However, if you want more shine and an even smoother surface, we invite you to undertake this final finishing step. Polishing can be divided into three stages: leveling sanding to remove the last defects, sanding for polishing, and finally buffing. These steps will be further detailed below. Also, take note:

• Always be careful when sanding, applying very light pressure, especially near the edges. It is easy to remove varnish if you press too hard!
• Always ensure you remove all dust generated by your work environment or sanding. One idea is to run a fan simultaneously to remove dust immediately.
• From time to time, "tap" or rub your sand paper on a mat to remove embedded dust.
• For a water-based finish, do not sand with water. Use a dry sanding method. If you sand with water on a water-based varnish that has not completely dried, you may slightly remove your varnish layer.
• When using water, always use room temperature water. Cold water can damage and crack your finish.

Before starting, the wood should have already been sanded with P800 or P1000 grit in the previous step.

Preparation

Before you begin, make sure you have both dry and wet sand paper on hand in grits P1000, P1200, P1500, P2000, and P2500. For optimal results during sanding, we recommend placing your guitar on a soft, stable surface—like a carpet or thick towel—to protect the body from scratches and ensure even pressure as you work.

Processing

Leveling Sanding:This step is only necessary if you still have localized imperfections (such as drips or significant roughness). In this case, you should sand down to P400 to remove the imperfections, then progress to P600, P800, and P1000. For localized sanding, the sandpaper is smaller, and a smaller sanding block—is used, as it is a very localized sanding process.

Tip: For sanding guitar edges and contours, flexible tools like a foam tip, rubber eraser, cork block, or even a thermal insulation sheath wrapped in sandpaper conform easily to curves, offering better control without flattening rounded areas. Mixing these lets you adapt quickly to different shapes while staying gentle on the wood.

Polishing Sanding:For the polishing step, refer to section IV. However, please note that this time, you should apply minimal pressure while sanding. The goal is to erode the surface, not remove material, but to eliminate slight surface imperfections created during the varnish application.

Start sanding with P1000 grit, then move to P1200, P1500, P2000, and finally P2500. Some prefer to continue, but you won’t notice a significant difference. Always remove dust using a running fan to prevent it from scratching your finish further!

At this stage, you should have a slightly whitened finish with micro-scratches removed. You can see this clearly by placing the wood near a light source and tilting it slightly to create reflections that make these scratches more visible. If you see micro-scratches, return to P1000 grit and work up to P2500.

Before (left) & after (right) sanding

It is now necessary to buff your wood to transform the whitish surface into an ultra-glossy finish.

Buffing

This is the final step, where additional products must be applied. You can either use dish soap mixed with water or apply dedicated polishing products, such as those available on our website. In particular, our polishing kit contains everything necessary for sanding, polishing, and hand buffing (a specific guide for polishing with this finishing kit is also included). Naturally, using products specifically designed for guitar buffing will provide much better results.

The selected polishing product can be applied either by hand or by machine.

By Hand: We recommend using microfiber cloths. Rub in circular motions, applying light pressure. Rinse and continue until you are satisfied with the result.

With a Machine: While dedicated polishing machines exist, you can easily use a drill with a polishing attachment to buff your guitar effectively. Always keep the drill moving at a moderate speed to avoid overheating the surface, as excess friction can damage the finish. Start with a firm pad for initial polishing, then switch to a softer pad to enhance the shine and achieve a smooth, glossy finish. Be aware that some areas may be too tight or curved for the machine to reach.

Note:

During this final buffing process, wearing a respirator and protective goggles is also advised, especially when using a polishing machine. Polishing product particles will be sprayed into the air.

Thank you for following our tutorial! You can find our Tru-Oil kit here: Natural Guitar Finish - Tru Oil Full Set