When you coat with epoxy you're sealing the wood from invasion. No water, no air, no microbes should get in. Anything already in the wood is entombed. I'm not a scientist but I think that without continuous sources of water and air all microbes are caput so there's no danger of rot. Putting anything between the wood and the epoxy can louse up the bond and invite invasion.
Charlie

: Don't have small piece of marine plywood and decided to water-seal a regular
: fir plywood (Thompson Seal) and then put on epoxy. Part is used for sail
: rig mount and will always be above the waterline, albeit under some
: splashes. Instructions for Thompson Seal (content unklnown, but I suspect
: is similar to tung oil) say that oil painting is possible after 5 days.
: Did anybody try epoxy after such kind of "seal"?