Yeah no kidding. That stuff is like 20 bucks a quart if I remember right. That's fine for a putty but ridiculous for a grainfiller. Certainly better grain fillers to use in that situation. I've never heard anyone ask for the grain to be filled before, in fact it would end out looking like laminate. Only species I would consider it on would be mahogany as the veneer just never turns out like the lumber.