We use this extensively for working with epoxy resin.
We use other rubbers also for molding, as PolyUrethane will not stick to Silicone & Vice Versa, so with the two rubbers you can make molds to then cast dozens or hundreds of other rubber products.
link to a table of properties
videos
demos
Link to colouring pigments
We only found 1 UK supplier & we found a large post-covid price rise, but they are good = MBFG
