[Rhodes22-list] Leaky Ports - techniques reply to Mike...

[Tootle]

Mike:

In today's world there are 'no blush' epoxies.  That is technical jargon for
not leaving a wax residue.  It is a big fighting point between the epoxy
sellers these days.  In addition to your acetone rinse, there is also
scuffing with light abbrasives.  A former member of this forum, a.k.a, Roger
P., also a chemical engineer who at that time was big into the technical
properties of epoxies expained the mechanical adhering methods of epoxies.  

I have also been around the 5200 circle.  That is why 3M developed 4200.

My situation was done initially following 'all' my expert advisors. (I have
Don Casey's book, and a few more, Hankinson's, Robert's.)  I had to rebuild
the glass work around the thru hull and redrill the thru hull hole.  The
boat life lasted a few weeks and I had to pull the boat and clean it down to
the epoxy reinforced with glass mat repair.  After cleaning area with
'acetone', I reinstalled the thru hull and used Rummy's Roofing Cement.  It
worked and still works after several on and off the trailer.

Now we have the development of the flexible epoxies.  Ah, more to learn.

Ed K



R22MikeW wrote:
> 
> Ed,
> 
> I also assumed Boat Life Seal Sealant (BLSS).  It is part polyurethane and 
> part silicone.  Be careful with the use of urethance sealants on
> portlights 
> since they will never release if rebedding or replacement is required. 
> The 
> plastic frames will be destroyed in the effort.
> 
> The problem that you speak of is most often seen with silicone materials 
> which are really only good as gaskets.  They don't stick to much of
> anything 
> for long.  The BLSS seems to have gotten around this problem, although
> when 
> rebedding portlights, it is mostly used as a gasket material.  In
> addition, 
> the epoxy repair should not be exposed to the sealant in this application. 
> I have used epoxy to repair the damage to the wood core from water
> intrusion 
> due to previous sealant failure.  The epoxy is below the surface (in the 
> holes) for these repairs.  The BLSS is exposed to the gel coat and the 
> plastic of the portlight frame.
> 
> BTW, as I have indicated, preparation is most important - DO NOT SKIP THE 
> ACETONE CLEANING STEP.  Placing sealant on a waxed surface will never
> result 
> in good adhesion.
> 
> Mike
> s/v Shanghai'd Summer ('81)
> Nissequogue River, NY
> 
> From: "Tootle" <ekroposki at charter.net>Sent: Friday, March 07, 2008 5:07 PM
>>
>> The term Life Seal Sealant was used in the discussion of leaky ports
>> under
>> the subject heading of Tangent Topping Lift Question.  Can I presume that
>> the sealants correct name is Boat Life Sealant?
>>
>> I tried to use that Boat Life in the cockpit drain a couple of years ago.
>> It did not hold up.  At the direction of a professional roofer on this 
>> forum
>> I used one part urethane roofing sealant.  It worked as he told me.  I 
>> also
>> used it on my project boat rebuild.  The stuff works and comes in many
>> colors.  The brand name Rummy referred me to was HP-1.
>>
>> The problem that the Boat Life seemed to have was adhering to the epoxy
>> repair.  I had used Boat Life for years just as a sealant, but it did not
>> want to stick permanently to the epoxy repair area.  That repair was with
>> the West System products.  Also, the repair was made about this time of
>> year, maybe a few weeks later when it was just warm enough.  I waited 
>> until
>> epoxy repair was fully cured.
>>
>> You might be able to do it in one day about June 21st.
>>
>> Ed K
>> Greenville, SC, USA
>> “It is not the critic who counts, not the man who points out how the 
>> strong
>> man stumbled, or where the doer of deeds could have done better. The 
>> credit
>> belongs to the man who is actually in the arena, whose face is marred by
>> dust and sweat and blood, who strives valiantly, who errs and comes short
>> again and again, who knows the great enthusiasms, the great devotions,
>> and
>> spends himself in a worthy cause, who at best knows achievement and who
>> at
>> the worst if he fails at least fails while daring greatly so that his 
>> place
>> shall never be with those cold and timid souls who know neither victory 
>> nor
>> defeat.”  Theodore Roosevelt
>>
>>
>> -- 
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>>
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> 
> 
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