How can I avoid bubbles in resin doming?

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Bubbles are a common challenge when doming resin, but with careful technique, you can achieve a flawless, glass-clear finish every time. Here’s how to minimise and remove bubbles for professional-quality results.

Mixing Techniques to Prevent Bubbles

Start by mixing your resin and hardener slowly and methodically. Vigorous stirring introduces air, so use a gentle motion, scraping the sides and bottom of your mixing vessel. Once thoroughly blended, let the mixture rest for a few minutes. This pause allows many small bubbles to rise to the surface and pop naturally.

Selecting a well-formulated doming resin, such as “Be Flex” Transparent Polyurethane Doming Resin, can also help, as it’s designed to create a smooth, bubble-free dome with minimal effort.

Pouring and Application

When pouring the resin onto your surface, do so in a thin, controlled stream from a low height. This reduces the chance of trapping extra air. Spread the resin gently with a spatula or toothpick, ensuring complete, even coverage without splashing or stirring up new bubbles.

Removing Bubbles After Pouring

After pouring, inspect your work closely for any remaining bubbles. Lightly pass a heat gun or small torch across the surface at a safe distance—this encourages bubbles to rise and pop without overheating or damaging the finish. Work quickly, and avoid lingering in one area; excessive heat can cause rippling or thinning of the dome.

Related products

• "Be Flex" – Transparent Polyurethane Doming Resin – Scratch-Resistant
• "Colourfun" – Liquid Epoxy Resin Colourant 25-100ml – High coverage

Related guides

• How To Set Resin Percentages On Domes

Mastering bubble-free resin doming takes a bit of practice, but following these steps makes it much simpler to achieve a perfectly clear result. For more tips on perfecting domed finishes and setting resin percentages, explore our full guide on how to set resin percentages on domes.