Hi Rick,
Epoxy resin and foam are compatible, foam and
polyester resin is not compatible. Epoxy won't
really bond to the ABS but will be okay as a
large backing block, after all it will be the
fastenings that end up holding the epoxy to the
ABS if I have the visualization correct.
Your repair idea sounds fine to me.
Cheers, Russ
Sweet 35 mk-1
At 09:36 PM 05/04/2013, you wrote:
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I recently bought an 8 foot Sandpiper hard
dinghy, thinking it might work better on the
davits on Imzadi than the Zodiac inflatable I
use now. I need some advice on how to make a reapir that is needed.
The Sandpiper is a molded ABS dinghy like a
Walker Bay, with foam filling between the inner
and outer skins. The center thwart of the boat
is wood, and it appears that it was originally
fixed in place with 4 screws that went into
plastic plugs pushed into a ledge in the  inner
skin of ABS. Apparently one or more of the
plastic plugs got pulled out, and the PO secured
the thwart with toggle bolts he bought at the
Ace Hardware. With age, exposure, and use the
toggle bolts have either corroded to extinction or pulled out of the ABS skin.
Iâm thinking that I might be able to use a
1â hole saw to open up a hole in the inner
skin, remove some of the foam core with a bent
nail (like removing the balsa core in a deck)
and fill the void with thickened epoxy. Then I
would drill and tap the epoxy plug for the
screws, and use LifeSeal between the thwart and
the  ledge because LifeSeal is supposed to bond to ABS.
My concern is that the epoxy will damage the
foam core, and will not bond to the ABS skin.
Has anyone had experience that can tell me
whether this might or will not work? Or can
anyone suggest an alternate way of attaching the thwart to the skin?
Rick Brass
Washington, NC
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