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Thanks for the details Big....I wish I knew what ISO implied...  ....No issues with epoxy sticking to vinylester???
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There are no issues using epoxy on vinylester/polyester unless wax is added, but polyester or vinylester bonding to cured epoxy surfaces can be an issue . . . especially if the blush isn't totally removed and the surface isn't skuffed up.
Here's a little blub from uscomposites on different resins.
http://www.uscomposites.com/polyesters.html
isophthalic polyester resin that is used where strength and durability is a must. Experiences lower shrinkage and a higher heat distortion temperature than orthophthalic type polyester resins. Used extensively in boat hulls and in fiberglass mold construction.
Vinyl Ester resin is superior in every property as compared to all polyester resins. This product is used in high performance applications in which high-strength and maximum heat tolerance is necessary. This resin is extremely chemical resistant when cured. Similar in strength to epoxies with much increased stiffness.