A blow torch is the best tool to get rid of bubbles in epoxy resin. Blow torch is used to pop bubbles from epoxy resin has cured for flawless finish.
A hair dryer or heat gun doesn't get hot enough to remove bubbles efficiently and can blow dust all over your wet resin. A butane or propane torch on the other hand, is easy to use and provides the heat, control and intensity to remove bubbles for a flawless pro finish.