[Public-List] crack repair and barrier costs

[Roger L. Kingsland]

Hi Michael,

I had to scrape vs. soda blast because the owner is selling the marina and
doesn't want to mess up the environmental assessments that start soon.  They
are about 1/2 through scraping GO148 and it turns out A) if he PO did a
bottom coat, he must have used really thin, invisible paint and, B) there
are several hair line and larger cracks in the gel coat which, although
added work, I am glad to have discovered since the boat will never be dryer
after 8 years on the trailer.

I am now researching blister/crack repair and barrier coats and would
appreciate any advice the "pagers" could provide.  I will go back to the
page archives as I am sure this isn't the first time this topic has come up.
I did find this weird web site http://www.epoxyproducts.com/barrier4u.html
with lots of information but poorly organized.

Best, Roger

PS - in defense of my "marina guy", he enjoys a good reputation and didn't
really mess up the other boat he showed me.  He just used a more lumpy
ablative paint.  He showed me another power boat that had some kind of
Teflon paint (VC 17?) that was much smoother; so smooth and slippery, he
said, the straps slipped when he lifted the boat with his crane.  Sounds
like "fast" stuff.
 

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of
crufone at comcast.net
Sent: Wednesday, March 16, 2011 5:25 PM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] bottom sanding



Roger, 

Confirm if the PO did install a barrier coat and if so what thickness he
applied. I would strictly caution you against using any grit abrasive paper
coarser than 80. If you have a barrier coat I might not even use 80 grit and
move up to 120 for the final stages. There is absolutely no sense in
removing the barrier coat if it was well done and well applied. 

FYI what you got from the yard is their way of getting the job done pronto
with the minimal effort and cost. Why gouge and roughen the surface just to
have to fair it down again?  This only make sense if they are doing the job
to meet some kind of cost restraint. 

Personally I wouldn't let them near my boat. Especially since you have seen
the mess they have made with others boats. 

Using the 36 grit even on a D.A. sander they will cut down through the
bottom paint so fast as to not be able to control going directly through the
existing barrier coat. Your existing barrier coat is an added valve for your
boat.........I wouldn't waste it. Carefully smooth off what you have and do
the fairing as you go. Remember bottom paint can be rolled and tipped just
as topsides paint. The result is minimal orange peal. 

Since they normally work on power boats..............I would say their
mentality is "with three 200's on the transom who gives a S--T how smooth
the bottom is!!" 

Roger we know each other well enough that I can speak so frankly about this
proposal to you.  I beg you don't let them mess up your beautiful boat. I
have seen all the work you have lovingly bestowed on "Perfect Intentions".
NOW is not the time to cut corners. You will be very unhappy with the
appearance and the depreciation of in the water performance after "your
Marina" gets done with her. 

Are you using VC-17 (a hard paint) on the bottom?  If so, you could fair in
between coats. But it is not recommended. Better to fair first and then roll
and tip the paint. 

If you are using any kind of ablative paint (a soft paint) then sanding
between coats is a non starter.  Most instructions are to install coats
within a certain time period. That is so one coat cures into the other. The
previous coats are not quite cured before the next goes on, so sanding just
makes a hugh mess. 

Michael #133  Call me 239.466.8802 
----- Original Message ----- 
From: "Roger L. Kingsland " <r. kingsland @ ksba .com> 
To: " Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>

Sent: Wednesday, March 16, 2011 1:51:54 PM 
Subject: [Public-List] bottom sanding 

Albergers , 

I have hired my marina to remove the bottom paint on good old 148 down to 
the barrier coat the PO did a few rears before I bought the boat.  The 
marina, used to working on power boats, recommends sanding the barrier coat 
and/or gel coat w/ 36 grit claiming finer paper will get gummed up right 
away from the left over paint after scraping.  I looked at other boats they 
refinished and the bottoms are pretty rough w/ lots of orange peal.  I am 
concerned that will slow down my race horse; after all, 1/4 of a knot means 
a lot more at 5 knots than it does at 25. 

I learned Practical Sailor is reporting on eco-friendly bottom paints this 
month and figure, if I use one of those, I can sand between coats to achieve

desired smoothness.  Any suggestions? 

Best, 

Roger 148     




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