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I might have missed this but, has anyone tried to use Flex Seal as mold compound. In the adds I see all over television the shill puts it in a cake pan and it comes out solid piece of rubber. I wonder what you'd use as a release agent.

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I doubt it is much different than plasti dip seen below. It will go bad very quickly before you use it all. I would not waste the money on it.

 

6535a368-9f0c-4959-9b30-2340e858de3d_1000.jpg

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It won't work very well. It is a solvent-based rubber material which will shrink as it dries (hardens). Unless the mold is very thin, the drying process will be very long and the shrinkage will be very noticeable.  RTV rubber mold material hardens by a chemical reaction (not solvent evaporation), so there is no appreciable shrinkage and it will set in thick layers.

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Yep, I just got an email from the Flex Seal Co. They said they have not tested it for mold making.

But I know you guys are right about it not working.

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If it is anything like Plasti Dip, it will dissolve any plastic it comes in contact with.

Here's a link to Flex Seal's MSDS (Manufacturer's Safety Data Sheet).  Note that its solvents are petroleum distillates--which generally are death to polystyrene plastic.   http://www.mcoe.us/view/1668.pdf

Art

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