[header] How to fiberglass a pond [title] Purchase fiberglass cloth, resin, and flowcoat. [step] You can buy the materials you need to fiberglass your pond from the hardware store or online. The typical fiberglass used for ponds is a 450 g chopped strand mat. 
This fiberglass is durable enough to retain the water from a pond. Purchase an epoxy or polyester resin when you buy the fiberglass sheets.