Hello All There were a few posts a while back that addressed some problems with top coat adhesion over CPES epoxy. If you go up on there web site you will see a product called Multiprime. This stuff is exactly the same as CPES just re named to address a different market for those wishing to use it as a primer instead of a rot restoration and repair. More importantly the application instructions regarding top coat application are different. On the Multiprime they recommend the topcoat be applied after the solvents have evaporated but before the epoxy cures. This will chemically link the topcoat to the epoxy ( a common practice with commercial epoxy coatings) The application instructions for the CPES call for a complete cure before applying top coats or fillers. That's probably because in rot restoration the CPES penetrates much deeper into the deteriated wood and much more time is needed for the solvents to evaporate. So it would appear to me that one or more coats of CPES left on just long enough for the solvents to evaporate followed by the first of the top coats will promote better adhesion. You wouldn't be able to sand the CPES you would have to begin sanding after the first topcoat. Brian Palmetto FL