Rated 5 out of 5 by anonymous from castin’ craft resin. clear polyester. i used this as an experiment to see if it could handle weathering .. The painting process was after assembling, just before first coat of epoxy resin and fiberglass. using tape for clear edge. the paint is acrylic on water base.. Epoxy resin. what is an epoxy resin and where should it be used? epoxy resins are powerful adhesives, which when properly formulated, soak into the wood, form a.