[arjan]

I am building a 43'' catamaran using both vinylester and epoxy. I don''t believe that there are any problems using them side by side but the problems arise from adhesion. If you apply Polyester or vinylester on top of epoxy the styrene in it will soften the cured epoxy making for a very poor bond at best. putting epoxy on fully cured polyester is problem free.
One of the advantages of using epoxy is its superior adhesion as compared to the esters, so i would use epoxy for the job.
Arjan Bok
www.rotkat.com