You will cause premature wear on your pump. Too hot will not harm the Juice but will cause more of it to "leak" out of the blank before it cures. It is there for 2 main reasons, contain the mess some of the Juice will bleed out when heated and to allow you to stack more blanks in your oven at one time.
Once the blanks are finished curing, remove the blanks from the oven with gloves and un-wrap the foil. No coupons required. Survivor Filter.
They are very concentrated and produce nice, vivid colors that mix and work well with the Juice. Cactus Juice is unrestricted for shipping by air as needed. Too hot will not harm the Juice but will cause more of it to "leak" out of the blank before it cures.