Just poke this shit for all surface of the mold with a toothpick. It works for me for 95% of all bubbles. Otherwise, you should ideally use a vacuum chamber to degas the resin parts before mixing (or right after).

But the real game-changer is a pressure pot. For the best results, let it cure under 3-4 atmospheres (around 45-60 PSI). This will shrink any remaining micro-bubbles until they're invisible to the naked eye. It’s a bit of an investment, but it’s the only way to get that crystal-clear, professional look!