if it is bmx that your on about, you cannot really do it, you will have to buy a whole new rim. .
yes a scratch can be buffed out of a chrome rim with some chrome polish and a buffer.
yes, the Red Stainlesssteel Rim Outdoor Tableware Set is very scratch resistant.
All rim brakes work by friction against the rim, and will eventually wear the brake surface on the rim down.
Only if you've gotten some dirt/grit lodged in the brake pad. Do note that all rim brakes will eventually cause some degree of wear on the rims.
If is actually chrome, there is no way to repair it PROPERLY without having the whole wheel rechromed. If it is not chrome but polished aluminum, a light scratch can be sanded out. Beware though, that most newer wheels have a clearcoat over them which you will also sand off. Once that happens the repaired area will corrode.
RIM owns RIM
The U.S. Mint did not make a nickel penny in 1977. If you have one it may be a regular penny with a coating or plating of some sort on it. Scratch the rim and see if there is copper underneath.
Scratch and scrimp
From rim to rim
There is no 'rim of heaven'
To scratch is a verb and a scratch is a noun.
From rim to rim