Bubbles are common. A simple way to eradicate them is by using a heat source like a heat gun or a small torch. Lighter = No (You will burn your finger off).
Also, we have special formulations that naturally have fewer bubbles like Liquid Diamonds.
PRO TIP: When mixing the epoxy resin and hardener...
the more volume of mixture you have in a pot, the more chemical reaction. This creates heat. To reduce the heat, mix the product efficiently within 3-5 minutes and get the mixture out and spread across the project.
The longer it stays in a pot the more heat. More volume = more heat.
More heat will not only create more microbubbles but it can make the cure brittle like glass.