A Blow Torch/ Flame Gun is the best tool to get rid of bubbles in epoxy resin. There are other methods, including poking with a pin or blowing through a straw, but these are slow and ineffective. A hair dryer or heat gun doesn't get hot enough to remove bubbles efficiently and can blow dust all over your wet resin.
Don't include gas cylinder.
Burning up to 1300°C, Don't too close to your moulds.
Never point at Any Human Being.
It must be control by hand.
Placing the gas cylinders upside down is prohibited.
Keep away from children.