Does this bolt directly to the frame without drilling?

Yes. This bar mounts at factory anchor points — no drilling or frame modification required. Standard hand tools and a lift will get you there.

Will this work with a custom or aftermarket front bumper?

This reinforcement bar is built to work behind any bumper cover, OEM or aftermarket. The cover sits in front of it, so fitment depends on the cover's internal mounting geometry — test-fit before finalizing.

Do I need to paint this before or after installation?

Paint this bar before you bolt it down. You'll have full access to all surfaces, and you won't risk overspray on the bumper cover or grille. Install it primed and sealed, or finish it to match your bumper color.