Bonding Primer works great on metal.

Pentart products are top shelf media imported from Europe

Water-based paint suitable to apply on surfaces difficult to paint, provides a strong bond between the surface and the coating layer. Tested surfaces: laminated furniture, wood, glass, glazed ceramic, tile, plastic, enamel, aluminium, copper, spelter, steel, iron, corroded metal. Easy to apply and spreads evenly. Can be sanded after it is dried. Any Pentart paint can be applied over the surface covered by the bonding
primer. The bonding enhancing characteristic of the primer has been verified by an independent accredited laboratory.