When applying Skin Protect, the skin must be completely clean and dry. If you are currently using any other topical cream or moisturizer, we recommend that you do not use it in conjunction with Skin Protect. Use 1-2 ml. for the hands of an adult, this is approximately the size of a dime. As for the rest of the body, we can say that a little goes a long way. If after applying the product it remains "wet" for more than one to two minutes, you have used too much. If you do use too much, simply dab off the excess with a clean towel. Skin Protect is safe for use on the entire body and face, and it is even safe for infants. The shielding properties of Skin Protect are effective for up to four hours.