Oh yes! If you don't cook the styrene out of the mould, the epoxy in the prepreg will crosslink with it and you'll have to rip it off, destroying your part and the mould surface.

You want to post cure slightly higher than your peak curing temp. You also need to ramp your postcure. Depending on the size of the mould between 2-5 degrees a minute.

If you're doing prepreg, you have to cure for that length of time anyway, so how are you curing your part?

If you are near the southwest, you can always hire our oven time, we have a fridge sized oven and a 1.2 cubed metre one.

Hi all