Roof Rejuv is a bio based spray on solution used to treat asphalt shingles that dries clear. Applying the proprietary solution every 5 years will lengthen the lifespan of a shingle roof 10-15 years depending upon treatments. Roof Rejuv is engineered to rejuvenate and strengthen asphalt shingles. The product is made of over 90% agricultural-based oils combined with a polymer. Roof Rejuv restores old, brittle shingles by bringing back their flexibility, i.e. the ability to expand and contract, making them just like new. -Dries clear and gives shingles like new pliability -Resists hail and wind damage -Reduces water permeability up to 97% -Is environmentally safe