Plywood Finishing Problems

Thin veneer on plywood is a fact of life. And every once in awhile you may run into a finishing problem. Especially when using open grain woods (like red oak). The adhesive that's used to glue the veneer to the plywood core can seep through the pores to the surface of the paneL

This happened to me while building a pair of doors for a cabinet. But the problem wasn't apparent until I put stain on the panel. Then white streaks of adhesive were visible.

With nothing to lose, I tried sanding one area where the adhesive was the worst. But after about five strokes with the sanding block, I had cut through the thin veneer.

Now I check for adhesive on plywood the same way I check for glue on an assembly. I wet a rag with mineral spirits and wipe down die plywood. Then I can see whether die panel will be any good or not

The adhesive in the pores of die wood looitt IiiĀ«; white streaks because it icon't accept sum.

Fir plys transmit irregularities to the surface

Thick

Hot Press Particleboard Adhesives Images

TRADITIONAL PLYWOOD

Fir plys

Fir plys transmit irregularities to the surface

Thick

Fir plys

TRADITIONAL PLYWOOD

Particleboard ply

Thin veneer

COMBINATION CORE

Firplys

Particleboard provides smooth surface for the thin veneer

Particleboard ply

Firplys

Thin veneer

COMBINATION CORE

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