I need a silicone that I can paint on to a vertical surface to capture a relief, is there such a thing?

Thixo is an additive that can be put into High Strength 2 to increase the viscosity (consistency) of the mixed silicone rubber which allows the user to paint on and build up the wall thickness onto large molds or vertical surfaces. Initial coats should be fairly thin to prevent air entrapment against the mold surface and secondary coats should be thicker and used to increase the overall thickness of your mold. The thixotropic additive can be ordered by calling only.