All of the black and loose lighter colored glass needs to get ground out... Try to get a nice tapered bevel out probably 5" on either side of the bottom of the keel. 1708 is fine, sometimes on a fix like that i will take some thick clear visqueen and make patterns out of it for cutting the glass patches. Clear so you can see underneath and judge where your glass needs to be. Probably end up with half a dozen or so different size patterns from big to small (largest piece of glass first).
Fill any voids with thickened epoxy, and pre-wet your patches. Then stick em on and hardroll. Peelply will really help keep it tight if you can locate some. Then fair to your satisfaction.
I hate grinding so id try to do it all wet-on-wet, fairing compound and everyting. (let the layup harden a bit before covering in fairing compound or it will slide around)
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