I don't know about epoxy to attach the angles, the angles are the only thing that attaches the bed, fenders and steps to the truck. Other than the rear X-member, the bed rails sit on the frame, bed wood on the rails and the bed angles support everything else.
I painted the angles and strips after debating between chrome and paint. I don't think painted angles with chrome strips with detract from the bed. Just leave them and move on
