The Rot Doctor


Subject: CPES and 3M's 5200 Date: Thu, 27 Jul 2000

I've decided to use CPES on my white oak frames. I'm using 5200 as a bedding compound/adhesive. Please tell me, does the CPES form a chemical link with the 5200. Or can I apply the CPES and then apply the 5200 after curing.

Thanx for your attention.

Michael H.


We have tested on new wood the compatibility of CPES and 5200. It sticks, and very well, to the point where you can't tear it off the wood (the 5200 comes apart before it separates from the wood). We tested it on cured CPES and CPES that had volatilized away the carrier solvents but with the epoxy still "tacky". It stuck just as well to the uncured epoxy as it did to the cured epoxy, maybe better. Not being a polymer chemist I am not qualified to say that there is any polymer bond, but I have heard through the grapevine that the epoxy in CPES will form polymer links with urethanes.

So there you are. Whatever the CPES and the 5200 does, for sure it sticks like hell. Use the combination with confidence that you are giving the wood maximum protection.