Pettit H2 Prime is a low VOC, two-part water-based epoxy primer designed for use as an adhesion promoter with Hydrocoat, Hydrocoat SR, Hydrocoat Eco, and Neptune5. When used with Bio-Blue Surface Prep 92, this non-sanding system is VOC compliant in all areas. This system does not void hull warranties against osmotic blistering. H2 Prime dries to a hard, durable coating that provides additional protection against scuffing and scratching. Extended over-coating times mean easier scheduling and a lower chance of paint failure due to missed windows. Provides excellent adhesion to polyester and vinyl gel coats. Cleans up easily with soap and water. Gallon.