The Skin Builder worked great on my sunburn! No blistering and peeling was minimal and quick. I went on a 5 hour river float with some girlfriends and did not use sunscreen because of all the harsh chemicals. The next day I felt like my skin was pulsing. I purchased one of the 4 oz. Skin Cell Builder used it at least twice every day. I used only about an ounce total for the whole sunburn and used it quite frequently in the beginning. The best is after a shower or bath, before drying off. Great products that I am confident about their quality and effectiveness.