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Last summer, I repaired several screw holes in my transom. I removed the screws, drilled out the holes and inserted a wooden dowel insert to fill the hole and then used Spectrum Gelcoat Repair Kit to finish the job. Before adding the dowels, I notice there was a very slow drip of water exiting frm the holes, a drop every few minutes. I let the holes drain for several days before adding the inserts and gelcoating. I thought I had done a good job but now I have noticed that there is a black, acidic residue that appears at the repaired holes, and also the repairs are showing hairline cracks that form around the perimeter of the repair. I will need to redo, does anyone have any advice on what went wrong and how to proceed on the redo? I appreciate any help!

Thanks!