SLOW-CURE™ 30 min. epoxy works best for forming reinforcing fillets on joints. It has the highest strength of our epoxies. It is waterproof and more heat resistant. SLOW-CURE™ can be used for bonding if you’re willing to wait overnight. Bonded objects can be handled after 8 hours and the cured epoxy reaches full strength within 24 hours. 4 1/2oz kit.