Aggie, for me, I usually pour the finish over the project to finish it, no matter if it's plywood or solid wood. What I do, is I use two parts ployurethane, and one part paint thinner mixed together. I lay the project flat in a large cookie sheet, then I slowly pour the mixture over the whole thing, making sure to fill and cover all of the project. Then when finished covering it with the mixture, I take it out of the mixture and let it drip off the excess back into the cookie sheet.After allowing the excess to drip off for a while, I wipe the extra mixture off with a rag. Then I hang it to finish drying the mixture, I will check it out every so often to see if there's any finish bleeding from the open spaces. This may seem to be a lot of work, but it really isn't once you've done it.
Len
P.S. I only use this dip or pour method on flat surfaces, I've never tried it on 3 demensional projects.