VFI always recommends pouring in the same conditions you will be using the cured product. If you expect to work in warm conditions, pour the rubber in an environment at similar temperatures. The process is the same if you anticipate that you’ll be using the cured product in cold temperatures. The rubber should then be cast in cool temperatures. This will prevent unwanted shrinkage or expansion of the mold that could compromise the casting process. Note: the cure will be affected depending on the temperature that you pour at.