I hope your mamma does not know you are using her tupperware. My wife would have me by my man parts if I used her tupperware. I'd be living in the shed full time.
The answer mainly is no the question is do you want it to stick to the plexiglass? If not mold wax is best, car wax works also. If you are using poly resins less chance of sticking, epoxy better chance. Make sure the plexiglass is clean, waxed, and buffed several times.