This video is an overview of all of the major ways to remove bubbles from resin. It covers everything from avoiding bubbles while mixing & pouring, removing bubbles using an ultrasonic cleaner, vacuum chamber or pressure pot, and what to do about surface bubbles. This is a great place to start for beginners but may also be helpful for more advanced resin casters too.
0:00 Introduction
0:18 Avoiding bubbles while pouring
0:49 Avoiding bubbles while mixing
1:39 Lowering the viscosity
3:00 Using an ultrasonic cleaner
3:51 Using a vacuum chamber
4:20 Using a pressure pot
5:21 Dealing with surface bubbles
6:19 A few extra tips
Text based version: https://lamellacreations.com/bubbles-in-resin/
I first cover the cheaper or free options to reduce bubbles in resin before moving on to more expensive methods. These tips are suitable for both epoxy and polyurethane resins; for polyester resins please do your own research before attempting these as I'm not experienced with it