Always get air bubbles when mixing epoxy...
Be advised...I'm not talking about using the heat gun on it. Just raising the temp a very few degrees...Like I said, even breathing on it will do the trick (That is, in fact, how I do it). I don't think that's going to radically alter your curing time.
I remember now where I learned it. Breathing on the mix is the accepted way of removing bubbles from the two part epoxy used for encapsulating coins and such in paperweights, coating bar tops etc. Envirotex is one name brand. I use it for laying fg cloth as per Dan Parson's instructions.