Some materials (notably ABS) require pre-drying before vacuum forming because they are hygroscopic. In the case of ABS, this is about 175F for 1 hour per mm of thickness.
Can the Formech be used for the “pre-drying”? Failing that, do we have some type of an oven where an 18 x 20" sheet could be dried at 175F for about an hour and a half? Could the plastic sheet be hung in the powder coat oven at that temp?