HENKEL Teroson Up 620 Gelcoat Filler, 241gr

Restore your boat’s surface to perfection.
The Teroson UP 620 Gelcoat Filler from Henkel is the ultimate solution for marine-grade surface repairs. Specifically designed for fiberglass and gelcoat applications, this two-part polyester filler ensures a smooth, high-quality finish, resistant to water and weather. Its fast-curing properties allow sanding within 20 to 30 minutes, enabling efficient repair workflows.

Whether you’re fixing osmotic blistering, cracks, or minor impact damage, this filler blends seamlessly with the original surface and is paintable for a professional look. The product comes in a 241-gram package, ideal for localized touch-ups and precision work.

Key Features & Specifications

Why Choose Teroson UP 620?

✅ Marine-grade strength – Specially developed for boat gelcoat repairs
✅ Waterproof & durable – Perfect for underwater or high-moisture areas
✅ Fast-curing – Save time with quick sanding and re-coating
✅ Smooth finish – Easy to sand for seamless blending with original surfaces
✅ Professional results – Trusted by marine service technicians worldwide
✅ Paintable surface – Compatible with marine coatings and finishes

Application Areas

• Gelcoat restoration on fiberglass boats

• Osmosis damage repairs

• Cracks, chips, and surface imperfections

• Composite and fiberglass repair jobs

• Pre-paint surface preparation

Instructions for Use

1. Surface Prep: Clean and dry the damaged area thoroughly. Sand surrounding area for better adhesion.

2. Mixing: Combine filler and hardener (2–3% hardener by volume). Mix until a uniform color is achieved.

3. Application: Apply with a spatula or plastic spreader in thin layers. Avoid overfilling.

4. Curing: Allow 20–30 minutes to harden at room temperature.

5. Sanding & Painting: Sand smooth with appropriate grit and paint with marine-grade coating if needed.