Bondo® Fiberglass Resin, 00402, 0.9 Quart, 2 per case
How to Waterproof Anything With Fiberglass - YouTube
Bondo 32-fl oz Color-changing, Heavy Duty, Waterproof Interior/Exterior Brown Fiberglass Resin Repair in the Patching & Spackling Compound department at Lowes.com