A few visible bubbles can be frustrating after you have planned a clear casting. Instead of immediately changing the resin or buying extra equipment, review when the bubbles appeared. Bubbles seen during mixing need a different investigation from air trapped around a dry flower or in a detailed mould. Resin Wale recommends a small, recorded trial before a larger repeat.
Watch the mixing stage
Follow the manufacturer's technique and working conditions. Mix thoroughly without treating the cup like a whisking bowl, and use equipment suited to the batch size. Do not skip mixing simply to avoid bubbles: incompletely combined material creates a separate problem. Note whether the mixture was already bubbly before it entered the mould.
Inspect the mould and inclusions
Fine corners, raised lettering and textured areas can retain air during a pour. Inspect them under good light while the resin is still workable. Keep inclusions clean and appropriate for the resin. Porous or moisture-containing objects may need preparation; test an offcut rather than discovering incompatibility in a valuable keepsake.
Plan the pour around the available time
Arrange tools and colours before mixing so the working period is not spent searching for them. Use the product's recommended pour method and depth. For a detailed mould, assess whether careful placement can wet the difficult areas first. Do not exceed the resin's limits just to fill the whole design in one operation.
Use heat only when the system permits it
A torch or heat gun is not a universal solution. Check the resin and mould instructions, and keep ignition sources away from flammable materials such as alcohol-based inks. If you are unsure, choose a non-heat trial approach and ask for product-specific guidance. Record what changed so your next attempt has a clear comparison.
Your project checklist
- Identify whether bubbles start in the cup or in the mould.
- Inspect corners and inclusions before pouring.
- Change one variable per test.
- Keep product instructions and temperature limits beside the work area.
Frequently asked questions
Should I always use a torch?
No. Heat must be compatible with the resin, mould and any additives.
Why test a smaller casting first?
It makes the cause easier to isolate while reducing material loss.
Find your materials at Resin Wale
Explore the relevant collections below and check each product's specifications before ordering.
Need help comparing materials? Contact Resin Wale with your project size and intended use.
Continue reading
- Silicone Mould Care: Cleaning, Storage and Demoulding
- Resin Pigment Types: Paste, Powder, Liquid and Alcohol Ink
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