Hello, I wish to harden plaster prior to vacuum molding.  Is there a recommended epoxy resin for this and a recommended application method? My inclination is a low viscosity resin brushed successively onto plaster heated to under 40 degrees. It is important that no moisture is produced during the vacuum phase of the subsequent molding process. I don't think this is really a risk but if anyone has any experience they could share with me I would greatly appreciate it.  Many thanks.