My wife's `iron enriched` shampoo bottle has obviously escaped from her soapy clutches and caused several unsightly chips out of our enamel shower tray. I was going to patch them with something like pollyfilla and then touch them in with some bath enamel paint . However, before i go ahead with this, and apart from advising a change to a non-metallic shampoo, can anyone suggest of a better way of repair.