Hi Graham, I have emailed my reply to you too. Providing the dent is on a flat panel and it is free from silicons/ contamination from car polish etc, then with slight moistening of the suction cup it should attach to the panel. It cannot work on curved/ double curvature panels as it cannot draw a vacuum. We do sell a hot melt glue dent puller kit that may be more suitable for your application, stock code J1930. There is a video on our website www.amtechdiy.com showing the product in use.