435 is our most popular resin for marine construction, repair and general automotive applications. Excellent for all types of fiberglass lamination, layup, and repair work. Good strength and nice wet out make this resin very popular. Note: To properly sand and polish the final coat, use our Surfacing Wax (sanding aid). Color: Transparent Blue, dries clear. All polyester resins come with the corresponding amount of MEKP Hardener