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How to Deal with Bubbles of Irregular Molds?
Working with resin is exciting—it’s where creativity takes shape. But if you’ve ever used jar molds, sphere molds, or other tricky shapes, you know the struggle: bubbles often get trapped at the bottom. Don’t worry, you’re not alone, and there are ways to fix it.
In this article, we’ll cover:
Why do irregular molds often have bubbles at the bottom?
This is because most molds have concave edges. During the resin curing process, rising bubbles become trapped by the mold structure, leaving behind those tiny bubbles.
How to deal with bubble problems?
- Removing Bubbles After pouring resin into the mold, wait approximately 30-45 minutes, then gently use a stick to scratch the inner edges of the mold to pop out trapped bubbles. Use a heat gun to blow any remaining bubbles on the resin surface.
- Using Deep-Pour Resin For deeper molds, it is recommended to use deep pour resin. This type of resin cures more slowly, allowing enough time for bubbles to rise, resulting in a smoother finish.
How to rescue bubbled pieces?
If the piece has minor bubbles, you can repair it by sanding sequentially with 600 to 5000-grit sandpaper, and finally polishing it for a smooth finish.