Color sanding/buffing can be tricky...as I've just found out!
I just 'rubbed through' on my fresh painted firewall
Get it wrong and you're back to square one!
Can you wait 'till "Piggy" puts on a little weight?

Honestly though,it might be better to take it to a
good bodyshop to
get their opinion and quote to rectify your problem.
Just my 2c
Jock.