Every skim coated surface was wet sanded 150grit to remove runs and foreign matter that had settled in the resin during cure. However, I don't think the time and effort is worth the work so I'll be waiting until all the coats are cure before tackling the sanding. I then added the canard's 3rd coat, the fuselage and nose hatches 2nd. The second is looking really nice and I'm tempted to do a full 5 coats as Cory Bird suggests. I'm thinking it may take care of specific low spots that I won't have to deal with later so it's sounding attractive for sure :)