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Old 19-04-2015, 11:38   #1
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Bottom job

See the attached picture. All opinions on how this occurs and solutions are welcomed. I know they used sandblasting techniques. Was this their fault?
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Old 19-04-2015, 13:10   #2
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Re: Bottom job

Difficult to make one's opinion with such a small picture. It looks like osmosis.


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Old 19-04-2015, 13:21   #3
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Re: Bottom job

For all I can tell from that picture it may as well be a magnified image of a napkin.

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Old 19-04-2015, 14:12   #4
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Re: Bottom job

New to the site, just realizing you cant blow up the attached picture. It looks like blisters from a distance but when you get close it looks like the gelcoat was brittle and flaked away from the fiberglass. It also appears that the previous epoxy repairs came out during the sandblasting. Almost as if someone shot a blunder buster at my boat, all over! Only thought so far is to use a high build epoxy coat.......
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Old 19-04-2015, 14:25   #5
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Re: Bottom job

Doesn't look like osmosis. No blisters. I'd fill with epoxy fairing putty, sand smooth, and barrier coat.
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Old 19-04-2015, 15:11   #6
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Re: Bottom job

Looks more like my hull after I've scraped the barnacles off it. The little circles are where they had stuck themselves to your hull. I would sand the area and examine it again. You can test for blisters by jabbing the center of a circle with a sharp awl. It shouldnt be soft.

Be wary of boatyard workers telling you that you have blisters; they need work and see yachties as cash cows. One guy looked me straight in the eyes and told me I needed a gelcoat peel and epoxy job, which he could do. I popped a barnacle off the hull, pointed to the circle, and asked him if he had ever scraped a bottom before. End of conversation.

I already knew he had a reputation around the yard for selling unneeded work...

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