Poly-G 20-28 Polyol Arch Chemicals Polyurethane (PU) - Polyols Coatings >> Solvent-Free/ High-Solids Architectural / Decorative Higher molecular weight polyols, like Poly-G® 20-28 and 85-29, are used for two-part, very high solid roof and deck coatings. high quality and reproducibility Diol High molecular weight diol. Used for two-part, very high solid roof and deck coatings. Offers high quality and reproducibility.