finishing interior plywood

[sailaway21]

Yes, you can make the plywood totally waterproof if you coat all surfaces of it with the epoxy. There are alot of wooden hulls out there relying on this fact. Of course, when you drill through it you must coat the opening and fastner going through it. WestSystem has pretty good brochures/manuals describing procedures and your local West Marine (no relation) usually has a stack of them.

[Goodnewsboy]

If you have a nice level finish coat in place, rubbing out a finish to reduce gloss can be done with a felt pad, pumice, and either water (for flatter finish) or linseed oil (for more gloss). Rub it until you are happy, then wipe it down to remove the residual pumice.

This is one of those things that is best tried on a sample piece before committing to the real thing.

Don't do this to exterior varnish.