Try a short bristle roller instead of foam. The foam seems to pump air into the resin. The bristles seem to work better.

> I tried a foam roller, and the bubbles were horrendous. Spraying would
> probably work best, but the epoxy I'm using has a tendency to run easily.
> I don't have enough spraying experience to work with this material (it'd
> be really touchy, runs at every opportunity).