[Sonar] Keel fairing

[Thomas_M_Brown at bluecrossmn.com]

Many people use autobody filler in error for fairing non-ferrous surfaces. 
    Autobody filler doesn't work for the reasons that you are now seeing.  
Its not designed to adhere to non-ferrous surfaces.

The best way to do this is to approach it with the Interlux or West System 
epoxy.      You'll need to remove the filler,  even the non-loose stuff 
and then put a vapor barrier (ideally) on the surface of the whole keel 
plus up into the deadwood (outside of keel sump) where you'll undoubtedly 
have some stress cracks.     After that the West System microballon filler 
(411) is my epoxy of choice but that's just because I have more experience 
with it than Interlux.   A very thin layer of pure West epoxy rolled on 
with a special roller  (don't use a latex paint roller) will really finish 
it up nicely before bottom paint.

I personally don't worry about fairing beyond visual too much but I do use 
long boards when sanding which tends to reduce localized fairing mistakes.

Give me a call sometime and I'll come take a look and see what's going on 
and can give you some advice if your still looking for it.

Thomas Brown
"Maximizing Business by Minimizing Surprises"



markkoch <markoch at gmail.com> 
Sent by: sonar-bounces at lists.wyc.org
10/31/2005 08:42 PM
Please respond to
markoch at gmail.com


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Subject
[Sonar] Keel fairing






I was not planning on fooling with my keel, but now that it is on the 
trailer I see that there are some areas of blistering where the fairing 
compound has pulled away from the lead.  I popped a few of them and 
there was water behind.  The material on the keel seems like auto body 
filler.  Kind of plasticy with some flexibility.  Some places it is very 
thin and other places one or two sixteenths inches thick.

I hate to remove it all because then I have no reference points to level 
back too.  But if I leave the sound areas alone, they might blister next 
year.

Only the lead portion of the hull has this problem--not the fiberglass 
hull itself.  One side of the keel is fine--the other about 15-20% 
blistered or loose.

What should I use for filler?  Epoxy with microballoons or some sort of 
autobody stuff like it has now?

Any suggestions appreciated.

Mark

Liberty.
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