Stoner M520 ZIP-SLIP^® eliminates the unwanted build-up of resin on the parting line, which can cause gaps, leaks, and messes, increasing equipment maintenance and clean-up time. TraSys^® ZIP-SLIP^® improves efficiencies by maintaining a tighter seal on the parting line, helping eliminate pinholes, voids, and blowholes. Stoner^® M520 ZIP ZIP-SLIP^® is a preventative maintenance product for rotational molders that eliminates build-up on the outer sealing edge of molds.