Hi! I have a Plug that I have sanded to a finish and I was about to make a mold for it using V/E tooling gel coat with a Heat distortion Temperature of 200 Degrees Farenheit. However, I need to bake my prepreg carbon fiber at 250 degrees and I am confused as to whether the tolling gel coat and the vinylester laminating resin with the Chopped Strand Mat will begin to deform at 250 so as to affect the shape of my carbon fiber or impede demolding.

Yeh, mould cant handle it. At that temperature, your mould surface will likely be the first thing to suffer. Depending on the geometry of your part and the layup of your mould, you could definitely experience distortion as well.

Some people dont mind pushing the Tg of their mould, but I'd advise against it. Find out if your pre-preg can do a lower temp initial cure and then post cure it out of the mould, or find a more suitable mould material.