Yes those darn bubbles!! grrrr... I use a heat gun and do several "light" heat blasts to get rid of those darn bubs. It's a challenge for sure. My first attempt sucked, and because, yes, I am working with my originals, there is the ever present reminder that if I ruin it, I ultimately completely ruin everything. No pressure, haha!
So far I've been pretty successful but I have had a lot of opportunities to work with resin, so I'm not too afraid of it. Not for the faint of heart for sure, and I would use paintings you're okay with losing if it's your first try/tries.
Thank you for asking me questions! I'm so glad you've sent so much inspiration my way!
Thanks for the info! Interesting stuff!