How to Stain Plywood
To stain plywood evenly, sand it lightly to 180 grit, wipe off the dust, apply a pre-stain wood conditioner, test the stain on an offcut, then wipe the stain on and off in one direction and seal it with a clear finish. Plywood blotches more than solid wood because its face veneer is thin and soaks up stain unevenly. On birch, maple and pine plywood (birch ply in the UK), a gel stain gives the most even colour.
Why plywood blotches
The face of most plywood is a veneer about 1/50 in (0.5 mm) thick, peeled off the log in one long sheet. That exposes wood with very different density side by side, and the soft areas drink up the stain. Birch, maple and pine are the worst; oak, sapele and walnut take stain well. The thin veneer also means you cannot sand blotches away: sand through it and the glue line shows.
Step by step
- Sand with 150 then 180 grit, by hand or with a random-orbit sander, lightly: never stay in one place.
- Remove all the dust with a vacuum and a slightly damp cloth.
- Apply a pre-stain conditioner and wait the time on the can, usually 15 minutes to 2 hours.
- Test on an offcut of the same sheet, edges included.
- Stain: wipe it on with a rag or a foam pad along the grain, leave it 5–15 minutes, then wipe off the excess in the direction of the grain.
- Let it dry, usually overnight, and add a second coat for a darker colour.
- Seal with two or three coats of polyurethane or a hardwax oil, sanding lightly with 320 grit between coats.
Best stains for plywood
| Stain | Result on plywood | Best for |
|---|---|---|
| Gel stain | The most even colour, little blotching | Birch, maple, pine plywood |
| Oil-based wiping stain + conditioner | Good, deeper colour | Oak, sande, birch with conditioner |
| Water-based stain | Fast, can raise the grain | Light colours, quick jobs |
| Dye stain | Even colour, strong | Experienced finishers |
| Tinted finish (stain + poly in one) | Builds colour in layers, can look painted | Quick projects |
Edges and plywood walls
Plywood edges are end grain and soak up much more stain, so they turn darker: seal them with conditioner twice, cover them with edge banding, or stain them separately with a lighter coat. For staining plywood walls, work one sheet at a time from top to bottom, keep a wet edge so there are no lap marks, and finish with a water-based polyurethane that does not yellow.
Frequently asked questions
Why does stained plywood look blotchy?
The face veneer is thin and peeled from the log, so some parts soak up far more stain than others. Birch, maple and pine blotch the most; oak and sapele stain evenly.
What is the best stain for plywood?
Gel stain gives the most even colour on birch and pine plywood because it sits on the surface. Oil-based wiping stain over a pre-stain conditioner is the next best; water-based stain dries fast but can raise the grain.
How do you stain plywood walls?
Sand lightly, apply a conditioner, then stain one sheet at a time from top to bottom with a rag or a pad, keeping a wet edge and wiping off the excess before it dries. Finish with a water-based polyurethane.
Can you stain prefinished plywood?
No: its factory finish stops the stain soaking in. Sand it back to bare wood first, or choose unfinished plywood.