Are those three holes actually all the way through the hull? If so, patch them with 4 ox cloth inside and out with epoxy resin. Yes, sand and clean with acetone first. Just about any epoxy resin will work fine. Be sure to sand scrape the patch edges and add more resin as needed to blend. You should be able to make the patch nearly invisible.
Not an actual hull breach? Then just sand, clean, and squeegee in some epoxy resin.
In either case, be sure to add some form of UV protection, whether with varnish or specifically formulated resin.
If it were my boat, I would just shrug my shoulders and paddle on, every scar tells a story. BTW, my boats and I have lots of stories!