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post #1 of 32 Old 05-09-2019 Thread Starter
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Fiberglass checks

I am looking for information to help me asses the quality of the fiberglass on a sandblasted hull to treat blisters.

I attach a picture in the hope that someone experienced can give me an opinion by just looking at it. I will take more detailed shots when I see it again this weekend. The black patches are residual paint.

I am not as worried about the process of sealing it and painting it, if the underlying fiberglass is in good condition, but I read a worrying article here about failed blister repairing that is raising my concern.

https://www.yachtsurvey.com/BlisterRepairFail.htm
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Last edited by Pasadena; 05-09-2019 at 10:42 PM.
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post #2 of 32 Old 05-10-2019
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Re: Fiberglass checks

The image you posted is too general. To have an idea on the quality of the fiberglass close shots are needed. All I can see is that the hull is not clean enough for repairs.
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post #3 of 32 Old 05-10-2019 Thread Starter
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Re: Fiberglass checks

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Originally Posted by celenoglu View Post
The image you posted is too general. To have an idea on the quality of the fiberglass close shots are needed. All I can see is that the hull is not clean enough for repairs.
Thank you celenoglu, Does it need more sanding? is it chemical cleaning you are referring too? I notice some pinholes with filler that I would need to clean too. I imagine it would need to be free of all paint staining and surface residues for the epoxy to behave consistently through the surface.

I attach another picture, this is the closest I got. I will take close up images this weekend.
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keel_2.jpg   keel_3.jpg  

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Re: Fiberglass checks

Although controlling directly by the human eye is the best method, I will try my best with closeups. A through cleaning the hull is a must. The fiberglass body will be visible only after cleaning the paint residue and the gell coat layer.
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Re: Fiberglass checks

Quote:
Originally Posted by Pasadena View Post
I am looking for information to help me asses the quality of the fiberglass on a sandblasted hull to treat blisters.

I attach a picture in the hope that someone experienced can give me an opinion by just looking at it. I will take more detailed shots when I see it again this weekend. The black patches are residual paint.

I am not as worried about the process of sealing it and painting it, if the underlying fiberglass is in good condition, but I read a worrying article here about failed blister repairing that is raising my concern.

https://www.yachtsurvey.com/BlisterRepairFail.htm
Looks like the article is a good lesson in how NOT to do a repair. If you are going to have this professionally done, you could discuss their process, and bring up some mistakes made in this article.

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Re: Fiberglass checks

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Looks like the article is a good lesson in how NOT to do a repair. If you are going to have this professionally done, you could discuss their process, and bring up some mistakes made in this article.
I need to do it myself or abandon the project. Doing it professionally will cost more than the boat. Trying to avoid nasty surprises once I start and realize that i can't be done.
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Suggestion.....
Unless you have a lot of free time abd good skills and a lot of tools..buy your first boat that is in great needs-nothing/little cindition.
Then learn more while actually using your boat...for fun
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Re: Fiberglass checks

Maybe it's the resolution but I can't see blisters in those photographs. Are you certain that's what they are? If that hull was "sand" blasted, it was either a very poor job or it may have actually created the damage you're seeing. I still see patches of color, which I assume are either barrier or antifoulant. The brownish color is what? Did they tear the gelcoat off? No one actually uses sand on fiberglass, it's typically soda or some other softer media. Sometimes ground nut shells.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
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post #9 of 32 Old 05-10-2019 Thread Starter
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Re: Fiberglass checks

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Maybe it's the resolution but I can't see blisters in those photographs. Are you certain that's what they are? If that hull was "sand" blasted, it was either a very poor job or it may have actually created the damage you're seeing. I still see patches of color, which I assume are either barrier or antifoulant. The brownish color is what? Did they tear the gelcoat off? No one actually uses sand on fiberglass, it's typically soda or some other softer media. Sometimes ground nut shells.
I will ask these questions on Sunday, when I see it again. I think the blisters are removed at this stage but I still see some little pin holes filled with a blue paste. Not sure what they are.

A bit of detective work ahead. Do you see damage on those pictures? I have never seen exposed fibreglass before, so I don't know how to compare it. Haven't found much online yet, still searching.
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Re: Fiberglass checks

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Originally Posted by RegisteredUser View Post
Suggestion.....
Unless you have a lot of free time abd good skills and a lot of tools..buy your first boat that is in great needs-nothing/little cindition.
Then learn more while actually using your boat...for fun
Yes, that would be wonderful, but there is nothing but wrecks out there, and I am looking with a decent budget. You also need luck, or not looking too close.

Lucky I haven't put my foot through a hull yet, almost happened the other day with a different boat ))
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