Sealcoating of your asphalt surface significantly beautifies and more importantly, protects your investment. Studies show that periodic sealcoating can increase asphalt lifetime by 6 to 10 times, as compared to a do nothing approach. Asphalt sealants are not created equally. There is a wide range of quality on the market today. In combination with superior application techniques, Howlett Services uses the toughest industrial grade asphalt sealants in the world.