I used it on my 2005 year, 2100 model. My fiberglass roof was showing strands of raw fiberglass. I fully cleaned the roof and let it dry, then taped off no paint areas. I used a 1/4" smooth surface roller for the large areas and a paintbrush on the small arears. I used less than 1 gallon of the paint. I did not prime, but Ithe instructions recommend it.It has been 2 years and it still looks great with no peeling. The roof is easier to clean and stays clean longer.