R22 Discussion Group

Ed and Elle,
One thing I remember from the one port that I redid, is that the sides of  
the R22 are not the same shape as the port. The sides on the R22 have a  
curvature to it where the ports are as straight as can be. I think it was this  
realization that made me use the urethane. I knew it was going to be hard to get  a 
good seal and I didn't want to do it again.

Rummy

In a message dated 3/8/2008 7:19:48 A.M. Eastern Standard Time,  
ekroposki at charter.net writes:

Elle  & Fred:

Alcohol is a solvent.  Can be used to thin epoxy  slightly, can be used to
clean tools that get sticky, can be used like  acetone to clean surfaces.  It
is non hazmat cleaner, whereas Acetone  is hazmat and requires gloves.  There
is a cleaning product for  projects like this called TA 661.  It is an
alcohol based cleaner that  is solvent-free (solvents are the hazmat stuff).  
This stuff is  available only by mail order from:

http://www.epoxyproducts.com/   (companies home  page)

http://www.king-cart.com/cgi-bin/cart.cgi?store=epoxy&product=.Misc.+products&
cart_id=4174102.22626&user-id=&password=&exchange=&exact_match=exact  
(this is where you page down until you find 661)

If you use the  Boat Life Product, and it does not work the first time, it is
an adhesive  and not a glue/cement as is Rummies product.  That means that if
it  does not do the job, you can always go back and redo the other way.   
Whereas using the stuff that Rummy recommends is like using 5200,  permanent,
but keep in mind, Rummy’s business is leaks.

Do not use  5200 like boat builders do, and that is not just you know who. 
It can only  theoretically be separated.  Been there, done that.   Too
difficult for average person to do.

About every 6 months, I post  this site as one of the best for how to do  it
knowledge:
http://westsystem.com/ewmag/  Subscribe to their  mailing list and usually
about one a year the send out an informative  magazine worth reading if you
are into fixing boats.

Ed  K
Greenville, SC, USA
Raisin: Grape with a  sunburn

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 abrasives.  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 explained 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

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Leaky Ports -reply to Elle & Fred