When casting in RTV, instead of sanding, is there something I can apply to glassy smooth resin parts that will dull them before priming?
My problem is only with Smoothon 300 resin with their RTV rubber and spray can mold release. The parts come out with an indestructible glossy sheen. I'v tried thinners, strippers, alcohol, gasoline, every strong chemical I could find around the house. Even swimming pool acid. Nothing works.Try wiping them with rubbing alcohol or lacquer thinner. That worked for me, by accident.