Adtech 77 High-Density Marine Filler – Below Waterline Structural Repair Putty

Adtech 77 is a professional-grade, high-density polyester filler engineered for heavy-duty marine and industrial applications. With superior compressive strength, excellent adhesion, and water resistance, Adtech 77 is the trusted choice for reinforcing boat structures and performing repairs that demand maximum durability.

Key Features:

• Below Waterline Approved – The only Adtech filler safe for long-term use below the waterline.
• High-Density Strength – Designed for heavy-duty repairs and reinforcement of marine structures.
• Exceptional Bonding – Bonds securely to fiberglass, composites, wood, and other marine substrates.
• Superior Compressive Strength – Handles high loads and stress without cracking or failure.
• Durable & Water Resistant – Maintains integrity even in constant water exposure.
• Ready to Use – All gallons and quarts include cream hardener (BPO) for proper curing.

Typical Applications:

• Reinforcing boat transoms, stringers, and bulkheads
• Heavy-duty fiberglass and composite repairs
• Structural filling in high-stress marine environments
• Industrial composite reinforcement requiring high density

Whether you’re rebuilding a transom, strengthening stringers, or making below-waterline repairs, Adtech 77 delivers unmatched performance. Its combination of strength, adhesion, and durability makes it the go-to structural filler for marine professionals.

Fiberglass Florida is proud to supply Adtech 77, trusted by boatyards and repair shops across the country. Order today for reliable, professional result