Asphalt shingles contain granules. The granules serve as the primary protection for the asphalt shingle against sun damage, fire, and moisture. Granules also give the asphalt shingle its color. As the asphalt shingle ages, it becomes hard and loses its ability to retain the granules. Rejuvenation is a treatment used to reverse the hardening of asphalt shingles and slow down the aging process, which is critical to increasing and prolonging asphalt shingle granule retention. Increased granular retention will significantly extend the performance life and appearance of the shingle giving your roof more life for years to come. Shingle CPR™ uses an exclusive, proprietary, patent-pending asphalt shingle rejuvenation treatment from SUSTANTURE®. ShingleAID® is recommended for clean, dry asphalt shingle roofs that are between 5 to 20 years old. The product is spray applied and formulated from recycled, sustainable seed oils that are 100% active, biodegradable and non-toxic.