I am blindly diving into my first fiberglass job on my square nose. layed my first glass yesterday and i was looking over it today and found several spots where there is a little air gap between the new glass and old body (mostly near the edges) would you recomend cutting these spots out and laying more glass over the top. or not worry about it and lay more glass (i'm going 2 layers regardless) also wondering what grit sand paper you use at first to sand the glass down for the next layer? i was using 60 grit. thanks for any help.