I generally use this in 1 gallon form, not for auto body repair, but for casting sculptures. I like this because it is easy to repair my sculptures after casting and is easily sanded. My biggest complaint is the stench, which is to be expected with a product such as this. Be sure if you use this for anything other than an auto body filler to be properly educated on the usage. I was specially trained to use this technique during my schooling. Be sure to wear proper safety gear (eye protection, respirator, gloves, and possibly coveralls).