Another common source of bubbles is too much decompression, especially in hot-runner molds. Yet another source is the screw, more specifically the rear zone or feed section. General-purpose screws with L/D of 18:1 or lower can be the culprit. Try using a lower rear-zone temperature and/or higher backpressure.Jul 21, 2014 · Warm the resin. This will prevent air bubbles from forming and make the resin easier to mix. Put a bowl of water in the microwave and heat. Put resin and hardener bottles in warm water for several minutes.
Learn to mold clay character maquettes with master mold maker Aaron Globerman (The Curious Case of Benjamin Button, Watchmen, The 33) including sculpture breakdown, setting pins for reassembly, minimizing air bubbles with sprues & molding with silicone.