Ultra-Light Epoxy Filler Sea-Line 1:1 – Easy Sanding for Large Areas

Sea-Line’s ultra-light Epoxy Filler (Lightweight Filler) is specially formulated for situations requiring filling of large areas or extensive damage without unnecessarily increasing the vessel’s weight. Thanks to its extremely low density, this filler allows you to apply thick layers over broad surfaces without risk of sagging or deforming as it cures. This makes it ideal for overall hull or deck fairing during yacht construction and refit, as well as replacing or rebuilding entire sections.

The material mixes easily at a 1:1 volume ratio (100:100 by weight), ensuring simple measuring and a homogeneous mixture. With a generous pot life of ~50 minutes at 20°C, you have ample working time to apply and shape the filler before it starts to set. By around 20 hours at 20°C, the filler cures and becomes easy to sand, greatly speeding up the fairing process. The cured filler is an off-white/light grey color which is easy to cover with primers and paint.

• 0.75 L set: Contains resin and hardener (A + B) totaling 750 ml – ideal for smaller repairs or filling localized areas. Perfect for DIY enthusiasts and small projects where only a small amount of filler is needed to achieve a smooth surface.
• 7.5 L set: Large set (total volume 7.5 L) for professional applications or extensive repairs. Recommended when you need to fair and fill entire hulls or very large sections of a vessel. The filler’s low weight means that even when used extensively, it adds minimal extra mass to the boat.
• Usage: Apply with a spreader/putty knife on a properly prepared (sanded and degreased) surface. Suitable for substrates like fiberglass (GRP), wood, steel, and aluminum. After curing (approximately 20 hours at 20°C), sand the area to the desired shape and smoothness. Always cover the epoxy filler with an appropriate Sea-Line epoxy primer before applying paint or antifouling for maximum protection.
• Recommendations: This ultra-light filler is especially useful in osmosis repairs – for example, when repairing widespread osmotic blister damage where large areas of gelcoat have been removed. It allows you to fill those zones without weighing down the hull. It is also excellent for building up smooth fairing on hull lines to reduce drag in the water.