Reply by PutnamEco

I have to wonder why the finish? Is it for aesthetic reasons or are you trying to protect the wood.

I often use plywood topped workbenches on jobsites and I find they hold up quite well unfinished. If it was made with exterior grade plywood it should hold up two or three years even if left exposed to the elements.

-- “The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little.” ― Franklin D. Roosevelt