HOW DO YOU PROCESS WOOD VENEER?


This guide explains step-by-step how to work with wood veneer, from choosing the right substrate to cutting, joining, gluing, and finishing veneer. Both beginners and experienced furniture makers will find practical tips for working with wood veneer here.

If you still have questions after this explanation, check out  Frequently Asked Questions or send us a message.

We will walk through the veneering process step by step.

  1. Orientation
  2. Which substrate is suitable for veneer?
  3. How to make  burl veneer flat?
  4. Cutting and joining
  5. Glueing
  6. Sanding and finishing veneer

1. ORIENTATION

Working with wood veneer opens up a world of possibilities for creating high-quality finishes on furniture, interiors, speakers, jewelry, and restoration projects.

Veneer is a thin layer of solid wood, typically 0.5 to 0.6 millimeters thick, glued onto a stable base material such as MDF, plywood, or other sheet materials. This lets you combine the look of solid wood with the stability and efficiency of sheet materials.

Before you start your first veneer project, it’s helpful to know that there different basic types of veneer exist, such as raw veneer and veneer with a backing (plastic or paper). URSA-MAJOR.shop sells raw (natural) veneer. The next choice is the aesthetic. Do you have a specific type of wood in mind, or at least a color scheme? Or is the grain pattern the deciding factor instead? On the WOOD SPECIES page, all the different types are neatly lined up side by side. The choice is yours!

2. WHICH SURFACE IS SUITABLE FOR VENEER?

Choosing the right backing board is essential for a long-lasting finish. MDF, plywood, bent plywood and bent MDF are among the most commonly used substrates for gluing wood veneer. A flat, stable substrate reduces the risk of warping and ensures optimal adhesion of the veneer.

Solid wood was often used as a backing in the past, but due to its tendency to shrink and swell, sheet material is a better choice.

MDF  is easy to work with thanks to the  uniform fiber structure  and  excellent adhesion properties. We do recommend lightly sanding MDF to boost adhesion further. MDF is affordable and available in many thicknesses. The downside is that it is  relatively heavy .

Plywood  (or 'triplex' in common parlance) is also suitable, provided it is of high quality.  Birch  or  poplar plywood  is widely available and suitable for veneering. For projects that come into contact with  moisture ,  waterproof-bonded Okoumé plywood  (marked with the terms 'exterior' or 'wbp') is an excellent choice. For best results, glue the veneer perpendicular to the grain direction of the plywood's top layer to add extra rigidity to the panel.

For  curved surfaces , flexible backing boards such as  bent plywood  or  bent MDF  are suitable.

 Plastic  and  metal  can also be veneered! This does require the use of special adhesive (such as contact cement).

It is also important when using a substrate that it be clean, dry, and free of grease. The substrate must also be flat and consistent in thickness. Please note that the substrate  must be free of defects, as these will show through the veneer.

Always remember to apply veneer to  the back or underside  of your workpiece  with veneer. This can be a more affordable wood species such as  Okoumé.
You will achieve the best results (meaning the least risk of warping) by using the same type of wood for both the veneer and the backing.

3. HOW DO YOU FLATTEN BURL VENEER?

Burl veneer belongs to the most spectacular but also the most challenging veneer types to work with. Its complex growth structure often causes waviness, tension, and distortion that must first be corrected before the veneer can be bonded.

One veneer sheet is flatter than the other. This may be due to the Storage method, the wood type or it pattern.
The vast majority of our wood veneer assortment is flat enough to be glued directly. 
Burl veneer is, on the other hand, often bobbled.Not going to use burl veneer? Then feel free to skip this explanation!

The wild pattern of root veneer, which is precisely its appeal, means that the tension in the veneer pulls in different directions. This creates the waves in the veneer sheet.
The veneer will need to be relatively flat to glue it properly.

At a Light curvature is this the simplest method:

  1. Lightly moisten the veneer and place it between paper towels
  2. }
  3. Replace the paper towel if necessary when it can no longer absorb moisture
  4. Once the veneer has dried, you can remove it from the press and it is ready to be glued.
  5. If you are not going to use the sheet or sheets right away, we recommend keeping the veneer pressed flat. After some time, tension in the veneer may return and cause bubbles again.

another simple method for slight curvature is by to Ironing:

  1. Moisten the veneer with distilled water
  2. Iron it as you would iron a shirt. Use an iron on medium-high heat without steam.
  3. Keep moistening the veneer with a spray bottle and iron it until it is flat. Make sure all moisture has disappeared to prevent the veneer from warping again

For severely bubbled veneer the above methods will not work, or will not work sufficiently.

We recommend a make mixture of the following:

  • two parts white PVA glue (wood glue)
  • one part glycerol (also called glycerine)
  • one part alcohol
  • three to four parts water

Apply this to both sides of the veneer and place it between paper towels. The process is then the same as the method described first (press until it is dry). You can treat and press several sheets at once, provided you place enough paper towels between the veneer sheets.

Experiment with this method, first with a remnant Because every veneer sheet reacts slightly differently. Take into account any residues that remain and how they can affect the gluing and finishing processes.

It can happen that your veneer is not very warped but so dry and brittle that it seems unusable.

You can repair this using a mixture of water and glycerol (also called glycerin). Glycerol attracts and retains water, which will make the wood supple again. Follow these steps:

  1. Mix one tablespoon of glycerol with half a liter of warm water
  2. Wet the veneer on both sides with this mixture
  3. Wait a few minutes until you notice the veneer becoming flexible
  4. Clamp the veneer between two plates with kitchen paper on both sides, using a weight or clamps. After roughly half an hour, wipe away the excess moisture with a cloth
  5. If the veneer is still damp, replace the kitchen paper and clamp it until it is dry
  6. Your veneer is now flat and supple, and ready to use in your project!

4. CUTTING AND JOINING


The correct cutting of veneer and the precise joining of veneer sheets determine much of the quality of the final result. Well-fitting joints create an almost invisible transition between multiple sheets of wood veneer.

Working with veneer starts with carefully cutting the veneer sheets. It is important to cut the sheets slightly larger than the final dimensions (one centimeter), so you can trim away the excess edges after gluing the sheets together.

If you want to size several sheets at once, it is handy to clamp a board to the veneer and guide the knife or saw along it. This keeps each veneer sheet even.

Trimming: cutting the veneer sheets to the required length can be done in several ways. Use a sharp utility knifescissors or veneer saw. The most common problem is that the veneer splinters when the saw or knife runs along the edges of the sheet. Prevent this by always cutting from the edge toward the center. Push the saw away from you when cutting the nearest side and pull the saw toward you when cutting the far side. Saw a few centimeters in from both edges and then cut the middle.

Cutting to width: often veneer sheets are not wide enough to cover an entire sheet, so it is common to join multiple strips together. Before you can join these strips, the edges must be cut straight. Do this with a sharp utility knife or veneer saw, cutting along a straight ruler or batten. It is crucial to cut with the grain, so you prevent the fibers from coming loose and the veneer from tearing or the cut line from running off straight. If you use a veneer saw, you have less of this problem.

Once the edges have been cut, you can join the veneer sheets with special veneer tape and/or masking tape.

Place the sheets against each other and tighten them with tape. Start with blue masking tape on the back and turn the sheet over to tape the visible side with paper veneer tape. Then remove the blue tape from the back to prevent air bubbles. Dampen the veneer tape with a sponge and then quickly press it down with a lukewarm iron for an immediate bond. Store the taped veneer sheet between two pieces of plywood to keep it flat and safe.

It is helpful to hold the joints up to the light ; if light shines through, you know the joint is not perfectly tight.

Joining  can also be done during gluing. Do this by letting the strips overlap slightly and heating the overlap with an iron. After that, you can cut through both layers of veneer with a straight ruler or batten. Remove the lower cut strip from beneath the lower veneer layer. In this way, both sheets will butt together perfectly.

5. EXPIRATION


Choosing the right veneer glue is just as important as choosing the veneer itself. The ideal adhesive depends on the substrate, the wood species, the application, and the way the veneer is pressed or processed.

Veneer bonding has traditionally been done with organic (natural) adhesives such as hide glue or bone glue. Antique furniture was often bonded with this, and it still has an important place in restoration work.

In the twentieth century, the adhesive industry changed with the development of synthetic adhesives. They are more resistant to water and heat, making them ideal for veneer work and other woodworking projects. Synthetic adhesives can be divided into two main categories: thermosetting and thermoplastic adhesives. Thermosetting adhesives, such as epoxy and urea formaldehyde, create strong bonds through a chemical reaction. Thermoplastic adhesives, such as most white and yellow wood glues, cure through evaporation and can be reheated to soften.

What should I take into account?

When choosing the right adhesive, it is important to consider several factors.

  • The open time of the adhesive, in other words, the time you have to apply the glue before joining the parts, varies depending on the temperature and humidity.
  • It is also essential to determine whether the adhesive moisture resistant needs to be and how it will react with the materials you are using.
  • When applying adhesive, it is crucial to use the right amount . Too much glue can cause air bubbles, while too little glue will not provide enough bond. Using a notched trowel or paint roller can help spread the glue evenly. Make sure the surfaces are clean and dry before you start gluing, and always follow the manufacturer's instructions for the best results.

Which adhesive is best for my project?

  • Hide glue or bone glue, one of the oldest types of adhesive, is still used for bonding wood joints and veneer work. It is sold in crystal form and must be mixed with water and heated before use. Although it is effective for certain projects, bone glue can weaken when exposed to moisture, which is a limitation for some applications. This adhesive still has its place when restoring antique furniture , where hide glue was also used back then. The brand Titebond also sells cold-application hide glue; Titebond genuine hide glue.
  • PVA glue (wood glue) is by far the most commonly used adhesive for bonding wood veneer on MDF and wood veneer on plywood. Thanks to its strong bond, easy application, and low cost, this is the best choice for most projects.
    It has a relatively short open time and is easy to apply. PVA glue can be used as veneer adhesive in two ways: cold pressed under pressure (clamps or weight) or hot pressed with an iron. It is important to make sure the materials are at room temperature and that the adhesive is applied evenly. PVA glue does not adhere well to oily wood species such as teak. For exterior work or humid spaces, there is D3 or D4 wood glue available.
  • Epoxy is a powerful adhesive that provides excellent bonding and is resistant to moisture. It is also suitable for materials other than wood, such as metal or plastic. Once cured, it does not dissolve and does not soften. It can “bleed” through to the surface of the veneer layer, which requires extra cleaning. It fills gaps well and, if tinted, can be useful for veneer layers with minor surface defects. It can also be mixed with wood dust to match the color of the wood, making it ideal for projects where aesthetics matter.
  • Contact adhesive is easy to use because it requires few tools. However, it is elastic and can sometimes cause problems when bonding narrow edges. Seams may also appear between strips over time. This adhesive bonds instantly , so it requires some preparation before the veneer is applied. Solvents in certain varnishes can soften the adhesive, causing the veneer to lift.
  • A good alternative to contact adhesive is Titebond Cold Press for Veneer.

To spread adhesive over a large surface, a paint roller can be used. A glue comb often works even better because the adhesive must be spread evenly: too much glue causes waves, too little glue leads to air bubbles.

Glue should be applied to the substrate, except with contact adhesive, where both surfaces must be glued. Spray the veneer with water after applying the adhesive so the veneer curls up less, allowing you to align and clamp everything calmly.

6. SANDING AND FINISHING OF VENEER


The proper sanding of veneer and the application of a suitable finish ultimately determine the appearance and durability of the project. A good finish protects the wood from moisture, dirt, and wear while keeping the natural grain clearly visible.

After the glue has cured sufficiently, the veneer will need to be trimmed, followed by removing the joint tape, sanding, and applying the proper finish.

When trimming veneer, it is important to keep the workbench clean. Place the workpiece with the veneered side on the workbench and cut off the excess veneer with a sharp knife at an angle .

Joint tape can be easily removed by first dampening it with a cloth or sponge. This loosens it and makes it easier to remove with a scraper or chisel.

This is also a good time to check the surface for loose spots. By lightly dampening the panel, any bubbles or loose spots may become visible. These must be repaired before the panel is further finished. Damp the front and back at the same time to keep the work from warping. Let it dry for about 20 minutes to bring the bubbles forward.

When repairing bubbles , new glue must be applied under the veneer. Cut the bubble open with a sharp knife at an angle (almost flat to the left or right) so the cut will not be visible later. Hold the bubble open with the knife and push glue into it until glue is present everywhere. After the glue has been applied, pressure must be applied to the repaired area. This can be done with an iron, clamps, or by placing the panel back in a press.

 sanding the veneer is a crucial step before you start varnishing. If you plan to use a water-based finish, it is wise to first dampen the panel to raise the grain. Use sandpaper that leaves no marks and work from a coarse grit to fine, always in the lengthwise of the wood grain. A grit of 240 is often fine enough for varnishing, but depending on your project, you can also stop earlier or continue with even finer grits.

It is important not to start varnishing too soon after gluing; the glue must be thoroughly dry to prevent damage to the finish. The choice of varnish must be matched to the glue used, because some solvents in the varnish can loosen the veneer from the substrate. For example, cellulose lacquer does not work with contact adhesive and water-based lacquer does not work with hot glue.

Any varnish, oil or stain sold for solid wood is also suitable for veneer .

The finish of a veneered surface is similar to that of solid wood, although some finishes are less suitable for veneer. Penetrating oils are for example less effective because they cannot penetrate deeply enough into the veneer. Non-penetrating finishes such as varnish, lacquer, and shellac are better suited. These finishes must be hard enough to protect the surface.

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