Water based Primer for Fiberglass, Aluminum & Wooden Surfaces. Features & Benefits: Enviro-Friendly Product. Chemically bonds to aluminum. Excellent resistance to corrosion and salt. Improves adhesion of final coat. Compatible with all other top coats. Scientifically formulated for use with Alumi-Koat Antifouling Paint. Exceeds VOC standards. No toxic fumes. Water based. Cleans up with soap and water.