I’ve noticed tiny “champagne” bubbles on the working surface of my finished mold, which are now being reflected in my castings. What causes these bubbles?
The description of bubbles as “pinholes” or “champagne” is an indicator that too much mold release was applied to the rubber mold prior to casting resin. People tend to get carried away, thinking that more release agent is better. This is not only a waste of release agent; it will cause “pinhole bubbling” to occur in the plastic. Remedy: use the “Spray-Brush-Spray” technique for applying mold release agent. 1. Spray a light mist coating to the mold surface, 2. Use a soft bristle brush to spread release agent over all surfaces including deep detail and undercuts and 3. Apply another light mist coating and let dry for 15 minutes before mixing and applying mold rubber. FAQ: After demolding a one piece block mold (poured), I noticed a single large air bubble on the working surface of the mold. What caused it, how do I avoid it in the future and can I repair the bubble? Answer: As noted before, air bubbles can come from different sources. In this case, the air could be coming from a few pla
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