[Public-List] Multiple pock marks on hull below waterline

[Michael]

I have a '67 #220 many years ago, being somewhat more ambitious, ground 
down to bare fiberglass preparatory to applying InterProtect. Blisters 
became apparent in that process, I had maybe four quarter sized. Smaller 
blisters seemed to form just under the gel coat (maybe head of pin 
sized), it looked like they just popped the surface gel coat off. 
Anyway, drilled two small holes (vertically) in the blisters-they were 
not deep in the GRP-a brown liquid under considerable pressure squirted 
out. A friendly Pharmacist provided horse sized needle and syringes, 
flushed the blisters with acetone, and injected thickened polyester, 
from the bottom hole until it squeezed out the top one. A down and dirty 
fix, for sure, but I have seen some awful remediations in the boatyard.
I am quite pleased with the result, there have been no more new 
blisters, and I keep the boat in water year round several years at a 
time.
I saved the hole saw piece of hull from a depth sounder install (an 
operation not for the faint of heart) it's 7/16" thick. These puppies 
are built like tanks.
Michael Grosh
#220
When I worked in a boatyard back in the '70's (for a very short time) we 
used an automotive product called White Diamond for fairing. I don't 
think it is available anymore, but it was an epoxy. I would use Marine 
Tex below the waterline, Then again, the whole boat is polyester, so I'm 
not sure what the advantage/disadvantage would be, but I believe it has 
to do with water absorption .  MG

------ Original Message ------
From: "Tom Swift via Public-List" <public-list at lists.alberg30.org>
To: "Alberg 30 Public List -- open to all" 
<public-list at lists.alberg30.org>
Cc: "Tom Swift" <swiftlaw at gmail.com>
Sent: 6/6/2020 2:51:25 PM
Subject: Re: [Public-List] Multiple pock marks on hull below waterline

>I also have a 1966 hull number 2 2 2.
>Being by my very nature less precise and slightly lazy oh, I sanded down my
>blisters but did not grind. this was  5 years ago and I use Bondo to smooth
>over the blister pick marks that were most notable on or around the water
>line. Flag blue boot stripe paint and an ablative paint on her bottom. Good
>as new in and out for $125 .
>
>On Sat, Jun 6, 2020, 1:11 PM americo silva via Public-List <
>public-list at lists.alberg30.org> wrote:
>
>>  not to old for blisters mine had them just starting and it was a great
>>  lakes boat
>>  1966 hull # 182 ground the hull completely and put a epoxy barrier coat on
>>
>>  On Sat, Jun 6, 2020 at 9:01 AM Richard Hansen via Public-List <
>>  public-list at lists.alberg30.org> wrote:
>>
>>  > I have a moonscape of a gazillion small (1/4-1/2) pocks, chips, blemishes
>>  >  (whatever the right word is) on Sunspur's hull at and below the
>>  waterline
>>  > (no blisters--she's probably way too old for that).  I suspect these
>>  pocks
>>  > have been blissfully there for decades, presumably sound under multiple
>>  > coats of not completely removed bottom paint over the years?   Now that
>>  the
>>  > boatyard sanded those security blankets off, what do I do with this 53
>>  year
>>  > old hull?  Can I just repaint with 2-3 coats of ablative bottom paint?
>>  Is
>>  > some sort of universal high-build epoxy primer & barrier coat
>>  (TotalProtect
>>  > or Gelshield or similar roll-on bottom coat) nice to have or need to
>>  have?
>>  > Seems improbable to hand fill and sand the moonscape.  Thank you for your
>>  > advice and guidance.
>>  > Richard Hansen
>>  > Sun Spur #235
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