The addition of A47 acrylic, U91 and UA60 urethane make Gaco one of the industry's only sole-source suppliers of polyurethane foam and roof coatings. We can be your source, too! Re-cover and renew a weathered low slope or flat roof with the GacoFlex S42 Silicone Coating System. This high-performance alternative to re-roofing is extremely versatile and