What Is a Low Exothermic Reaction in Boat Epoxy Resin?

What Does Low Exothermic Reaction Mean?

During the curing process, epoxy resins generate heat—a reaction called exotherm. A low exothermic resin is formulated to release heat slowly and in smaller amounts. This reduces the risk of the resin overheating, which can otherwise cause warping, yellowing, cracking, or even incomplete curing, especially in thicker pours or large boat surfaces.

Practical Guidance: Choosing and Using the Right Resin

• Deep Castings: For thick pours (up to 5 cm), EpoxyTable 5-Five is specifically designed with a low exothermic reaction, minimising the chance of overheating even in large or deep marine applications.
• Wood Reinforcement: For sealing and reinforcing wood, especially with fine grain or porous timber, EpoxyWood offers deep penetration with manageable heat release, ensuring a durable, waterproof finish.
• Thin Layers: For coatings or smaller castings up to 2 cm, “Trasparente” multipurpose resin is appropriate—always respect the recommended thickness to avoid excess heat.

In all cases, avoid exceeding the manufacturer’s suggested pour thickness and consider working in stages for larger projects.

When Does Low Exothermic Reaction Matter Most?

Low exothermic properties are vital when pouring thick layers, working on large surfaces, or dealing with bulk volumes (over 8 kg or lengths exceeding 100 cm). This ensures even curing, prevents discolouration, and preserves both the integrity and the appearance of your wooden boat.