Nothing is easier to use. Just shape and heat. If you need to remove it, it removes immediately, leaving nothing behind. I bought a pack and did the following with a pack: caulked the air conditioner condensate pipe, replaced the water heater drain gasket, molded a large and a small resin craft marble, and gave the rest (about a quarter of a pack) to a friend to try. A little goes a long way and legally it's easy as they say.