Although we don't use it here I know what capping is for. I just can't work out what metal capping would be for at all though, it just seems pointless.
How dare you suggest such a thing !
Just wait a while and I will rack my brain to think of one!
Mmmmmmmmmmmmmm
Still thinking
Mmmmmm
No,sorry can't think of anything (however trivial the anything may be)
I think you have just sussed out that some of the means of protection that could be afforded gets muddled up by designers who believe myths rather than how to comply,now where's that pot of paint gone