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  #21  
Old 04-18-2012
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Re: OK, so I'm Sanding My Bottom...

Hull Blisters on Boats and Yachts - by David Pascoe, Marine Surveyor

After reading some of these commentaries, I'm left wondering if there is a "do it right" solution....

In which case whatever I do will be the correct responce...
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  #22  
Old 04-18-2012
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Re: OK, so I'm Sanding My Bottom...

Yes, Pascoe paints a fairly dim picture on blister repairing. Well worth reading all of that section before you attack your job.
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  #23  
Old 04-18-2012
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Re: OK, so I'm Sanding My Bottom...

And a very practical article on blistering by Jan de Groot, a surveyor with decades of experience. Interesting point of view.
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  #24  
Old 04-19-2012
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Re: OK, so I'm Sanding My Bottom...

Yep... The more I read up on it the beter I feel about it...

Quote:
After reading some of these commentaries, I'm left wondering if there is a "do it right" solution....

In which case whatever I do will be the correct responce ...
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  #25  
Old 04-22-2012
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Re: OK, so I'm Sanding My Bottom...

Just finished up sanding... Feels like I've been sanding for a week...

Wait a second...I have been sanding for a week...

Anyway, after laying under this thing, staring at it day after day...It really doesn't look all that bad...Overall shape is still discernible just has a hundred or more "divots" to fill, so it shouldn't be too hard to "fair out" and get smooth...



After the 1/8" of ablative coating was sanded off, the resultant divots were only a 1/16" deep on average so not much filler will be required...



Worse one was the big one in the front (first page) but even that one is less than an 1/8" deep..



I think the late afternoon "shadows" were making it look worse than it is in the first couple photos...

Plan is to fill and fair with Fiberglass Marine Filler and then a coat of Polyester Resin overall, scuff sand and then hard biocide finish...
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Old 04-22-2012
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Re: OK, so I'm Sanding My Bottom...

Quote:
Originally Posted by Squidd View Post
Just finished up sanding... Feels like I've been sanding for a week...

Wait a second...I have been sanding for a week...

snip...

Plan is to fill and fair with Fiberglass Marine Filler and then a coat of Polyester Resin overall, scuff sand and then hard biocide finish...
Can you remove that sea strainer and lightly sand that area too? I took mine off this year allowing me to paint under the strainer but I had to take out the 4 screws holding it in place.

The 3M Marine Filler is a vinyl-ester product but seems to be intended for what you plan on using it for.

Conventional wisdom has it that epoxy resins have better adhesion than polyester resin which is why people barrier coat with epoxy. However, David Pascoe doesn't seem to think that conventional wisdom knows very much about blister repair.

Your hull does not look so bad after your sanding so have at the next phase.
Good luck with your plan.
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  #27  
Old 04-22-2012
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Re: OK, so I'm Sanding My Bottom...

There was another cover/strainer over that sea strainer...(blue rectangle)...that I took off...

I think that bubble is part of the thru hull, But I can take another look...

Using Evercoat 574 Marine Fiberglass filler supposed to be for below water use...Don't know if that's different than 3M product.

As far as epoxy vs poly...sounds like there is no expert schedual for permenent repair of blisters so whatever I put on is going to fall off...or not...
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Old 04-22-2012
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Re: OK, so I'm Sanding My Bottom...

Congrats on the job! I'd suggest one more thing to do before you start filling and fairing. Make sure large (and small) areas the remaining gel coat are not peeling, loose, or barely holding on. Good luck!
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Old 04-22-2012
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Re: OK, so I'm Sanding My Bottom...

Quote:
Originally Posted by Frogwatch View Post
I agree with the wide flexy plastic thingy.
The wide, flexy thingy is called a screed. An old hand saw blade works well - just grind the teeth off so you have a flat edge.
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Re: OK, so I'm Sanding My Bottom...

I'd only use epoxy and epoxy mixed fillers myself, but I've been using the stuff for over 20 yrs. My son and I used to build strip canoes... glass and epoxy clear coated in and out. Even when we stopped that and started traditional boat building there was still plenty of things to use it on. Now on bigger boats it's amazing.. the barrier coat is like armor.. the bottom paint scrubs off from river debris but the barrier coat is untouched even from the mooring buoy scuffing it.
just saying..
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