T&T: T&T CPES and Topcoat Adhesion

[Trainman484848@aol.com]

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