Hiya - hope you are all well and dandy

I've just had an epic of work done and have noticed some damage by a
workman, not that bad but annoying as these units were new.

The bath has had a chunk of enamel taken out of it revealing the
steel. I guess I need to re enamel to stop the rusting etc and
wondering how I do this?

Also wierd things have happened to the bathroom ceramic sink. There
are metal coloured (like scredriver metal) thin scrathes inside and
outside the sink bowl that are neither indented nor raised and don't
rub off. not really sure what they are as the sink is all ceramic?

I'm loath to get the same guy back to sort this out based on other
problems

any advice greatley appreciated

Cheers