not sure if you started yet, but i'm actually doin this right now.
tools needed: cut off wheel, fiberglass mat, not cloth, resin, body filler, 60 grit sand paper, heated area, patience.
what i'm doing is cutting the vent off off totally. then feather the edge down on both sides. and be sure to sand about three inches beyond the outside of the hole. now, start with two layers of glass on the back side. make sure it doesn't balloon out through the other side, keep it as tight as possible. then sand it down a little for the next layer. then cut two pieces 1/8" bigger than the holes, but the same shape. lay these down in the holes, smoothing out, but filling the holes completely. then sand this down for the next layer. cut this piece a 1/2" larger around than the hole. this will be your final layer. now, sand it as smooth as you can, and apply the body filler. now make it smooth as a baby butt.
and remember:
start from the back,
lay 1 or 2 layers at a time,
wait 2 hours minimum between layers,
and sand between steps.
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