Bondo(R) Fiberglass Resin Jelly is a milled fiberglass reinforced, non-drip jelly formula. Recommended for repairing and filling minor rust-outs on metal, wood, plastic, fiberglass autobodies, boats, campers, farm equipment, and snowmobiles. Great for vertical surface repairs. Spreads easily and is sandable in only 20 to 30 minutes. Can be used with fiberglass cloth or mat if additional strength is needed. Compatible with all paints. Waterproof. Includes Red Cream Hardener.