XT-493 (thixo) has been discontinued, and replaced with XT-765.
This thixotropic tin catalyzed (condensation reacted) RTV-2 silicone was designed to be used when painting OR spraying onto vertical surfaces. It does not use the mold rotting thixo additives so widely seen today, but offers the end user same ease of use and reproduction of detail. When catalyzed with one of our library life extending catalysts and stored correctly, a longer life of the cured silicone should be expected. It's high tear strength, elongation make it an excellent choice for any mold making application. It is also resistant to inhibition by most common mold making substrates, eliminating the need to use mold sealers.
The initial coat can be applied as it is OR with a tin catalyzed non-thixo silicone such as GI-1000, Gl-2020, or UFC to obtain the highest amount of detail and consecutive coats applied soon after. You can utilize embed in between layers to help strengthen the mold and resist tear.
XT-765 Technical Data Sheet