Epoxy Delam'-How do I fix?

Epoxy Delam'-How do I fix?

Post by Charles Sigmun » Wed, 08 Mar 1995 09:33:58


I have a 8' 6" AHD which has been a trusty and faithful companion.  
Unfortunately, all the chop in the gorge has taken its toll on its hull.

The underside is delaminated with the exception of the extreme end of the
tail, nose and rails (essentially the entire center portion of the hull
skin has separated from the foam core.....)

I'm thinking of cutting the skin open and spraying in areosol contact
cement to re-attach the skin....Then using marine-tex to fill the cut and
repainting the bottom....Will this be an good repair?  Please advise.  
Alternative solutions much appreciated.


Thanks!

 
 
 

Epoxy Delam'-How do I fix?

Post by unkno » Thu, 09 Mar 1995 11:03:39



   Newsgroups: rec.windsurfing
   Date: Mon, 6 Mar 1995 16:33:58 -0800
   Organization: University Computing Services - Oregon State University

   I have a 8' 6" AHD which has been a trusty and faithful companion.  
   Unfortunately, all the chop in the gorge has taken its toll on its hull.

   The underside is delaminated with the exception of the extreme end of the
   tail, nose and rails (essentially the entire center portion of the hull
   skin has separated from the foam core.....)

   I'm thinking of cutting the skin open and spraying in areosol contact
   cement to re-attach the skin....Then using marine-tex to fill the cut and
   repainting the bottom....Will this be an good repair?  Please advise.  
   Alternative solutions much appreciated.

A better fix is to drill small holes through the glass along the
delam then inject resin into the holes. This reattaches the skin to the
core. Use small plastic syringes available from marine supply houses
to inject the resin. Epoxy resin is available there as well. The
optional resin/catalyst pumps are way worth the price.

I did this fix when one rail of an old epoxy/carbon board blew up like
a balloon on the way back from San Luis Resevoir on a hot day. I also
installed a vent!

Jack Greenbaum -- Research Engineer, Ricoh California Research Center
---------------------------------------------------------------------

---------------------------------------------------------------------
Analog:  (415) 496-5711 voice  |  2882 Sand Hill Rd. Suite 115
         (415) 854-8740 fax    |  Menlo Park, CA 94025-7002
---------------------------------------------------------------------

--
Jack Greenbaum -- Research Engineer, Ricoh California Research Center
---------------------------------------------------------------------

---------------------------------------------------------------------
Analog:  (415) 496-5711 voice  |  2882 Sand Hill Rd. Suite 115
         (415) 854-8740 fax    |  Menlo Park, CA 94025-7002
---------------------------------------------------------------------

 
 
 

Epoxy Delam'-How do I fix?

Post by b.spedd.. » Sat, 11 Mar 1995 23:58:31


...

Quote:
>The underside is delaminated with the exception of the extreme end of the
>tail, nose and rails (essentially the entire center portion of the hull
>skin has separated from the foam core.....)
>I'm thinking of cutting the skin open and spraying in areosol contact
>cement to re-attach the skin....Then using marine-tex to fill the cut and
>repainting the bottom....Will this be an good repair?  Please advise.  
>Alternative solutions much appreciated.

...
I saw one response to this before this post turned up, couldn't repond then
tho'

I've also got an epoxy board which has large blisters (10-15cm) which are
quite domed. The board overheated inside a van. I'm sceptical about being able
to press the laminate down onto the foam even if i drilled holes, injected
resin etc. as the laminate is so hard and appears to have stretched. Will i
have to re-heat? Could I suck it back on using a vacuum cleaner, ie drill
hole, inject resin then put vacuum over hole to pull laminate onto board?
Anyone had experiences with this?

Bruce

 
 
 

Epoxy Delam'-How do I fix?

Post by John Gullot » Fri, 10 Mar 1995 11:24:21

I agree.  My technique is to drill 5/32 inch holes about every 3 to 4
inches or so.   Mix the resin (epoxy with EPS foam boards) and
microballoons (ketchup consistancy) and shoot the stuff into the holes.  
One problem is too much resin causing the skin to puff out too far, so be
ready to clamp the bottom flat to maintain its shape.  Little bumps can
be faired flat by sanding.  Be careful not to grind into the glass though.

One other source for syringes.  Go to a Veterinarian.  They have syringes
to shoot liquid  medicine into a dog's mouth (i.e., Pepto Bismol or
Kaopectate) and they are a whole lot cheaper.  They'll hold about 35 cc's
or so.  You can drill out the nozzle too so the goop squeezes out a
little easier.

Good Luck
John Gullotti

 
 
 

Epoxy Delam'-How do I fix?

Post by Jnf80 » Fri, 10 Mar 1995 11:29:31

Depending on the condition of the board otherwise, the old skin can more
than likely be peeled away pretty easily.  I'd do so and then re-glass
with a couple of layers of 4oz S-glass using epoxy resin.  Be sure to
repaint using a waterproof paint -- I have used Interlux (brand) epoxy
primer -- it's a two part paint, can be obtained in white, and really
holds up well.  It is the paint I use for complete boards as well as
repairs.  John