Forgot, 3M also list shore hardness of 5200 as 68A, full cure. This is about
the hardness of your daughters Barbie doll head.
BF

"BF" wrote in message
...
3M lists tensile strength of 5200 as 638psi in salt water, Emerson &
Cuming
26 Eccobond GP Epoxy has an adhesive bond strength of 2100psi.
No personal experience but the numbers don't look appealing.
BF


"Roger Long" wrote in message
...
Does anyone have any direct experience with how well 5200 sticks to
old but cleaned up fiberglass?

I have to put a new backing block in for a through hull in a very
awkward location. Since it's a Signet Knotlog, it has to be flush and
there isn't much back up in the taper for a direct hit on some
floating object. I'd like the back up block to be actually backing it
up.

Building up with fiberglass and epoxy working through a hand sized
opening is going to be tough. I'm wondering if a larger than normal
sized plywood backing block done with 5200 might not be nearly as
strong.


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Roger Long