Regular room temp cure epoxy is not massively stable in high temperatures. It can become soft if left in the car on a hot day. Mixing it with sand /gravel helps a little but the best approach is to heat cure the resin or post cure. You can do this as a diy job by building a make-shift oven around your mold using sheet metal. You can then heat it with a plug in heat element from a BBQ smoker ($50 on ebay).
....
How long do you need to post cure and at what temperature?
We use cookies to optimize our website for you and to be able to improve it continuously. By clicking the "Accept" button, you expressly agree to the use of cookies. For further information on cookies, please refer to our privacy policy.