I'm painting some wood storage cubes for my sons' bedroom. I'd like to use some of the extra wall paint so I don't have to buy more. We used Ben Moore washable flat latex on the walls, but I'd like to have a bit more gloss on the cubes. Can I put a few coats of clear polyurethane over the paint when I'm done to give it the gloss, or do I have to go out and buy gloss paint in the same color (something I'd like to avoid). If I can, should I use water or oil-based polyurethane? Thanks.
-Holly