This is a four and a half ounce package of Bob Smith Industries SLOW-CURE? 30 Minute Epoxy. SLOW-CURE? 30 minute epoxy works best for forming reinforcing fillets on joints. It has the highest strength of all the BSI epoxies. It is waterproof and more heat resistant. SLOW-CURE? can be used for bonding if you?re willing to wait overnight. Fillers such as microballoons can be mixed with SLOW-CURE? to form a putty-like consistency. Such fillers will usually decrease the working time by about 25%. Bonded objects can be handled after 8 hours and the cured epoxy reaches full strength within 24 hours.