Just finished cleaning up focus ST mk2 front subframe, it's had 2 coats of Bilt Hamber epoxy & was wondering if advice would be to leave as is or finish off with something else
Me personally would paint with 2k or if not at least enamel . In the past when I didn't know I left as is and it chalked over time as it's not uv stable.
Deffinately add a top coat, you've done most of the work getting to this stage. I've sprayed and brushed Lechler LS155 (29155) Acritop 2K acrylic, it's like a tougher industrial version of auto 2k gloss topcoat. Good stuff but it does contain isocyanates so needs a proper air fed mask.