I want to harden my pep pieces with smooth-on resin, but not sure which one to use. 385? 300? or smooth-cast roto? I'm not sure. I got in big trouble yeterday because I used fiberglass resin... I brought it into the house before it was 100% oder-free, and my mom pitched a fit. She has a VERY sensitive nose. So I need to get non-toxic stuff, to prevent dying. Thanks!