I have molds similar to these (https://www.amazon.com/Pieces-Tray-Silicone-Resin-Mold/dp/B08QCW94W4/ref=mp_s_a_1_4?crid=3KXO0PLS176VA&dib=eyJ2IjoiMSJ9.TE9p_7t49ahlLAbQ99E5h8s2hfrWWCdrGsvfjzJJLrP1bGQfEZiDNeDquT1l09SV_PEQPieXAfIuOAryYbmQV9TL2KnNUAGTgQMUCHjjlyP_ghpNmydYtW1-4UDimVg32U2uDTANppkre0_fm3_3xoCrAZQFJ9QRiMapkFiwLHZzpYEQVXIKhyWa2B7PgSKnPubqd5qzofvM7YIu3BAIqQ.xR3bIKiY1q4Q4bL2qPrRYK-BwYHeDOCDDy5LJGW1Yr8&dib_tag=se&keywords=resin+tray+mold&qid=1723754746&sprefix=resin+tray%2Caps%2C85&sr=8-4) and I always get tiny bubbles in the lowest area of the mold – the area that’s the top lip of the sides of the tray when unmolded, does that make sense? Using my heat gun on the top (the bottom of the tray when unfolded) it doesn’t reach the area in question, and heating from below doesn’t penetrate the silicone enough to pop the bubbles. Hope all this makes sense. Thanks!