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#1
10-02-2007, 02:06 PM
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Blistering blues
So now that the boat has been flipped and all the bottom paint removed there is 30+ years of nicks and scrapes to fix. It seems in the past all that was ever done was just to recoat with bottom paint. There are many many small pimple type blisters that I ground out with the drimel tool. Unfortunately thare are maybe 20 or 30 larger blisters (about the size of a quarter) that are blisters below the mat that will be much more intensive to repair.
Pimple blister and nicks and scrapes.    Larger blisters that will have to be ground out. Quarters for scale.  Deep delamination and close up.   Ground out larger blister (still needs a little more grinding)  A couple of questions. Since I am planning on spraying the bottom with gell coat, what is the best product to fill the small pimple type blisters with. I am thinking the 3M high strength repair filler (vinylester based). I would like to use the system 3 quick fair (epoxy based) that I already have but am unsure of the compatability with the gellcoat that will be going on top of it. Anybody have any good reccomendations. I'm also wondering if I'm doing more damage than good by grinding out the larger blisters. On the surface, there's no apparant damage but below the mat and fairly deep into the glass there is delamination. I wonder if I would be better off just leaving those larger blisters alone. What do you guys think. Thanks -will 
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#2
10-02-2007, 07:11 PM
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Re: Blistering blues
Not sure about the quick fair question. This is from their web site regarding epoxy resins:
"Can I put polyester gelcoat over cured epoxy? In general, polyester resins won't cure properly or bond well to epoxy resin products without a "tie-coat" barrier resin in between. System Three SB-112 resin system can be used as a tie coat in between epoxy laminating or coating resins, and polyester laminating or gelcoat resins. Using this resin allows you to gelcoat an epoxy-built or epoxy-repaired boat. " as far as the blisters go I would do like you are doing, However be careful how much you grind out. It just makes it that much harder to fix and fair later on. I don't envy you during this stage of the game.  strick
__________________
"I always wanted to piss in the Rhine" (General George Patton upon entering Germany)
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#4
10-04-2007, 08:40 PM
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Re: Blistering blues
__________________
3 Boats / 1 Floats Re-fit or Reef-it
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#5
10-07-2007, 07:24 PM
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Re: Blistering blues
So, I decided to grind out all the deep blisters. Some had water coming out. It seems that all the deep blisters were between the woven roven and the mat. I had to grind some of the areas back pretty big to chase down all the delaminated/undersaturated mat. I'm planning on fixing with the raka epoxy and 1708 biaxle glass that I have used thus far.
      
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