If you want a Factory look, you can do an outside in Patch with Glass, Resin, and Gelcoat or Paint. Not that hard. One dayu job..Maybe not even a full day. This video is a pretty good guide on HOW TO!!!
[video]https://www.bing.com/videos/search?q=patching+a+hole+in+the+hull+from+the+outs ide&&view=detail&mid=D3055B0E48588D117A22D3055B0E48588D117A22&&FORM=VRDGAR[/video]