[tsubaki]

Not having used Awlgrip, I would expect it's like most paints. Until fully cured you should have the problem of the paint gumming up on the sand paper, a usual way around this is to use waterproof sandpaper and wet sand the runs by dipping into a bucket of water and block or hand sanding.
If the runs and blushes aren't too severe you can buff to shine the problem areas.
During periods of high moisture in the air, the addition of a retarder will stop blushing but make sags and runs more prevalent also increasing the drying or cureing time.
If you have never used a retarder, it was intended to keep the paint wetter longer on the surface due to drying too quickly while painting in excessive heat.