How Can I Avoid Bubbles in Thick Boat Castings?

Choose the Right Epoxy for Deep Pours

The thickness of your casting influences your resin choice. For pours up to 2cm, a clear multipurpose option such as “Trasparente” Clear Epoxy Resin provides excellent clarity. For layers over 2cm, opt for a dedicated deep pour product like “Epoxytable 10-Ten”, formulated for pours up to 10cm and offering very low viscosity to help bubbles escape naturally.

Mixing and Pouring Tips to Minimise Bubbles

Proper mixing is key. Stir gently yet thoroughly, scraping the sides and bottom of your container to ensure a uniform blend without trapping excess air. Pour in stages, allowing any trapped bubbles to rise and escape between layers. Working in a stable, dust-free environment and at ambient temperature further reduces the risk of bubbles.

• Mix slowly to avoid whipping air in.
• If possible, use a heat gun on a low setting or a fine torch briefly over the surface to encourage bubbles to burst after pouring.
• For especially thick pours, give the resin a few minutes to settle before applying heat or adding the next layer.

When This Matters Most

Bubbles are most problematic in clear or decorative marine castings, or when visual perfection and structural integrity are vital. Deep pours, such as thick coatings on tables or wood inlays on boats, require careful handling to avoid cloudiness or weak spots from trapped air.