[Delw]

The company I used to buy all my fiberglass for boat work sold pretty much everything to make molds, they had hundreds of different products ranging from high to low. alot of it had to due with shrinkage as to how it was priced. as far as color its hard to say cause every product has a a few different colors. we used the RTV cause that was the in thing back then (2001-2002). it worked and served the purpose

we even tried the dental stuff ( cause we used it by the case for our inspection dept.) that stuff had very little shrinkage but after a few weeks it got brittle and cracked plus it was pretty expensive.

I have heard of guys using window silicon some say add a little water and its suppose to work really well.

Delw