'CASTOLITE'

[Anonymous]

HELP !
Many years ago I used a FANTASTIC blue rubber-like compound named 'Castolite' for making MOLDS, which I believe was a 2 part epoxy. From some of the molds I have made thousands of castings.

This great product seems to have disappeared from the market.

Does anyone know of a suitable substitute ?

THANKS !!!!!!

[HAZMAT9]

You may want to take a look at: www.alumilite.com. I've used their casting products which is fast and works pretty good. The support staff even has a webpage with FAQ's and a forum which helps with casting questions. Try their quick RTV which sometimes comes in a introductory kit w/ a video included. BTW, their webpage seems to be down at the moment, if you can't get through, just do a search for "alumilite" and you can probably find it in a retail store. Good Luck, Steve

[dehusman]

Its not an "epoxy", its a 2 part RTV (room temperature vulcanizing) rubber.

There are several companyies that make it. I have used Alumilite regular and Dow Corning HS2 (sold by Alumilite). Both worked well, the Dow product is stretchier.

Dave H.

[bobwhitten]

Try the silicon rubber product from MicroMark. Its blue and quite easy to use.

Bob Whitten

[mrunyan]

I have done tons of molds for hobby and professional projects. I have found that the alumilite rubber will tear out and you lose fine undercuts and details that way. The Dow RTV 1000 type is a blue (Tin) curing agent and some molds last 10 years. All RTV, including the blue, never truly stops curing and will eventually have tearouts but only after the 40th pull at least and not the first like happened to me, using the yellow alumilite rubber. The yellow rubber is cheaper, usually right on the shelf and handy, but only good for open face molds with no undercuts. Check places like Vagabond in CA or Eager Plastics in Chicago or Freeman Mfg & Supply (freemansupply.com) or web search for RTV. Happy molding