Repairing a Leaking Fiberglass Fountain

A fiberglass fountain leaking at a bottom seam needs a waterproof repair that withstands constant water exposure. Here are the best approaches.

For Crack/Seam Leaks

Silicone caulk (100% silicone, marine-grade) works well for localized seam leaks. Clean and dry the area thoroughly before application.

For Full Interior Waterproofing

Use a brush-on waterproof membrane designed for ponds/fountains:

• Sealoflex or similar elastomeric coatings
• Available at pond supply stores (many ship nationally)
• Apply to clean, dry interior surfaces per manufacturer instructions

Product Source Example

Coastal Pond Supply carries suitable products and ships nationwide.

Application Tips

• Drain and dry fountain completely (24-48 hours)
• Clean with mild detergent, rinse thoroughly
• Apply in thin, even coats
• Allow proper cure time before refilling

For structural cracks, combine approaches: caulk the crack, then coat the entire interior.