Join Date: Jul 2008
Location: chesapeake bay
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treat it like any other crack or hole. grind out until the crack is gone, then taper it out 12 to 1. if the crack goes all the way thru try to leave the inner most layer of glass to give you something to add glass to. you might even want to add a layer or two on the inside if you can reach it, then grind to the new glass, and build it back up. you dont really need to worry about the type of resin because you need to use epoxy any way. now for glass weight anything around 7 to 11 oz will work, lighter end if it needs to bend around a tight curve.
now the spot you are talking about is where the most force is concentrated on a grounding... did you hit bottom anywhere?
now as you grind it out you need to look at the layup to make sure you dont have the laminate separating. this can be seen by the glass layers looking white vrs the yellowish it is normally. you should get a fiberglass guy to look at it, possibly with 2 trips one before you grind one after. you ins may pay for the repair
edit it might be from the shipping if they did not block it right, also you might want to drill down in to the ballast to make sure its dry.