|Forum topic by DCollison||posted 01-22-2013 10:33 AM||6332 views||0 times favorited||5 replies|
01-22-2013 10:33 AM
I have questions re: a finish on an unusual project.
I am affixing a paper collage to a wooden panel using a mixture of wheat paste and a heat applied adhesive (fusion 4000). I wish to apply a finish to the collage that I can rub out to a gloss finish.
The surface of the paper collage is not even. For instance, the edge of one paper may be higher than another at joints. I have applied two layers of West system epoxy over the collage surface to build up the surface so that it can be sanded without breaking through to the paper. Though the epoxy levels of its own accord, the surface isn’t perfectly even.
I sanded the epoxy surface with 400-grit wet/dry, and then applied a water-based polyurethane. However, I can see scratch lines on the epoxy from the wet/dry paper through the polyurethane finish.
Do I need to sand epoxy before applying water-based polyurethane? Do I need to sand between coats of water-based polyurethane? In either instance, what grade(s) of sand paper should I use?
Is there a better finish (i.e. lacquer) for rubbing out to a gloss finish?