You can sharpen that edge yourself. The deal is to get matching gel coat. Clean the area with acetone, scuff it up with 220 or 320 grit, wipe clean again, Then get some aluminum angle "iron" from the hardware store, fold some wax paper lay it in the angle iron...ready for the gel coat. When you mix the gel coat youll need some ground fiberglass filler ("Cabasil" white powdery stuff)to mix with the gel and thicken it. Pour it into the angle iron and press up into the transom. Then remove the alum angle and the wax paper will stay until cured. It will surely be a mess to start with but you will be an expert by the time your done. Make sure you know what parts of your boat are inthe water at speed so you dont have to do any more than you have to. When you got that down you can do the strakes and chines that are affected at speed. Greg