No heat required! This is a heavy-duty industrial cold dip, air-dry plastic coating with good insulating qualities. It is easy to use; just apply and let dry. Requires no heat for curing and is flexible at all temperatures. It is very durable after it is cured onto the item, and it adheres tenaciously. Dries at room temperature (one coat) in about four to six hours. Coatings may be built up with additional dippings. Great for tools!