Are you painting your core and then glassing over the painted surface getting delamination and wondering why?
If so the answer is don't paint your core first before glassing. The resin needs to make a chemical bond with the core. If you paint first, then the bond between your core and glass is only as strong as your strong your paint bond. Not good.
Never paint the core.
+ one more
Only-- I look at the resin bond to the core is a mechanical bond , (not a bond between atoms).
Wikipedia makes it difficult to decide, in there definition .
I know that a bond between cured epoxy to cured epoxy, is also a mechanical one ;but
a bond between uncured epoxy to another layer of uncured epoxy, will result in a chemical bond
because the atoms that make up the atomic weight-chins , are now interlocked .
A chemical bond is an attraction between atoms that allows the formation of chemical substances
The mechanical bond is a type of chemical bond found in mechanically-interlocked molecular architectures ...