I have had some crazy adhesion problems! First I sanded the original primer that was on the frame and painted the red, I waited until it was good dry before I started painting the darts. Then when I was removing the tape from the darts, the red painted lifted right up with the tape in many places. I had to take the whole thing back to bare metal and completely repaint it. And I still had more adhesion problems that had to be touched up to complete the paint job.