Please remember 5200 is an adhesive, not a sealer. Unlike epoxy, its bond
strength is not comprimised by flex or thermal dimension changes.
Steve

"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.


--

Roger Long

http://www.simplicityboats.com/jointtest.html

Roger,
These are joint tests on plywood, not a backing plate on vinylester
glass so it's not apples and apples, but it is knowledge... My belief
is that the 5200 will work just fine for your knotlog backpalte given
the low psi load that will be put on it... I would not hesitate to use
the 5200 for what you are doing..

denny