The Rot Doctor


Subject: Vinylester over CPES
Date: Mon, 08 Feb 1999

Can Vinylester resin be used over CPES? I've been told Vinylester does not provide a really waterproof seal over wood or as good a bond as epoxy, and I wondered if a CPES pretreatment would improve things.

Thanks for your help.

David D.


Vinylester is a relatively new product and I don't have a lot of experience with it on wood. I do know that it is basically incompatible with epoxy -- the two SHOULD NOT be used together.

Do you have a particular reason for wanting to use Vinylester? Normally we suggest that one or two (or more, if you want a totally waterproof thin epoxy covering) coats of CPES be applied to dry wood at the rate of 1 coat a day. The CPES penetrates very well indeed and stays with the wood forever. Follow-up work would then be with epoxy resin, ours or others' -- they will all bond at the molecular level with the CPES coated wood. You now have a waterproof barrier, if that's what you are looking for.

Come back if you have additional questions.