Brian Nystrom wrote:

Paints such as Interlux Britesides are commonly used directly over epoxy.

Still, it may be wise to adhere to the manufacturer's recommendations,
which for Interlux brightside reads:

CLEAR EPOXY: Clean as for Bare Fiberglass. Sand with 80 grade (grit)
paper. Remove sanding residue. Apply one coat of Epoxy Barrier-Kote
404/414.

Mike Worrall
Los Angeles