Couple of things I usually recommend to get good bonds of TPE (Thermoplastic Elastomer) and PC: a. Melt temperature is critical for a good bond. The melt temperature for overmolding is usually 390- 440F for overmolding over polycarbonate. The TPE has to be over the minimum melt temperature of 390F from start to finish. If it goes below this melt temperature at any point, the TPE will not bond to t...