I want to put a stain over epoxy/fiberglass. Yea, I know, supposed to put the stain[water-base] down first before the glass. After putting glass on my current project, I have decided I want the inside of the boat darker. Will get the epoxy very smooth/ready then apply Minwax Polyshades[Polyurethane with stain in it]. Planning on several thin coats until I get the desired 'look'. Buff/scotch brite smooth & then varnish, probably with Captains. I will be doing a test but is this going to work?