Allowing the resin to de-gas for a few minutes after mixing and using slow and smooth brush strokes can help minimise air entrapment. Also, building up your required thickness in thin coats will help a little too. 

If you are talking about bubbles under the carbon skin then heating it up will only make it worse as the bubble usually expands and grows.

It may be safer to use a hair drier as the temp from a head gun is considerable.

Heat gun definitely works, but you have to be careful to not hold it too close or have it on too high so the air distorts the surface. You also don't want to heat up the resin too much, as this lowers it's viscosity and can cause it to fish-eye. 

Hey guys so I am fairly new to carbon fibre and I am currently overlaying a dashboard. I seem to have this issue where my piece has small bubbles and sometimes larger ones. I was told to use a heat gun and go over the part to remove the bubbles, is this true? I've done it but I'm not sure it seems to be making it worse. Making is ripply.  What is the best way to avoid bubbles?