I'm looking at a mid 80's hobie 16. unfortunately, the previous owner left it in the water for a period of time and it developed blisters in the gel coat. I have not seen the boat in person, just looking at photos, but it looks like everything under the waterline is affected. Can these be repaired and what is involved in the repair? I've enclosed a photo, the black paint was added by me to the photo to cover the reg. numbers. Thanks for any input.
Scott