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

[Mike Lehman]

Best fairing compound - System 3 Quick Fair - above or below waterline

On Sat, Jun 6, 2020 at 9:06 PM Michael via Public-List <
public-list at lists.alberg30.org> wrote:

> 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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-- 
Mike Lehman
~~~_/)_/)~~_/)~~~