The A.M.G. Lex-Guard S-31 Shingle Roof Spray Syatem is exactly what you think it is. Once your shingles are installed or they are up to 5 years old, symply have thiscoating applied to your roof and extend the life of your roof by as much as 25 years. The formula is so advanced that acid rain, u.v. jet fuel, acids, bird droppings, snow, salt, ice nothing will break down our formula,not even the harshest hails or rainfalls. Once this is isntalled on your shingle you will not have to chang e them again for the next 25 years.That is our gurantee.For your installation needs or to become a distributor in your area. please call 1-877-LEX-COAT and join the needed team to save our landfills from filling up with debris.Thank you: Torsten Klasen -President-A.M.G. Specialty Coatings CanadaWindsor & Toronto