37 foot Dolphin, 8AM-3PM. The lower 1/5 of the RV, light blue in the pictures, took up almost 50% of my time on site. That gelcoat just kept drinking my supplies- regardless of pad/compound or glaze/designed for urethane or fiberglass. Didn't matter what I threw at it, everything had to be gone over at least twice. Work time was non existant as well- had to move in 1 sq. ft. or smaller areas. THIS IS WHAT HAPPENS WHEN YOU DON'T TAKE CARE OF YOUR RV/BOAT. The rubber roof was cake, took a broom style wash brush to it with Gold Class 3:1 Simple Green. Probably went through 8-10 gallons of wash water to get the whole RV done- and there was still some mildew on the white gelcoat. Used Collinite Fiberglass Cleaner by hand and it worked well- but splotchy on the oxidized surface. Had to follow up with Opti Seal and red pad. Class A/9ft or taller RV's just went up $1-2 per foot in my book.