If you have mild curb rash and just want to touch-up to prevent corrosion or flaking, brush-paint the blemishes silver, then clear-coat. (See if OZ would give you a sample of the paint.) 😈
BUT you will STILL always see and be aware of the gashes. 😕 (Nobody else will notice it though, LOL)
If you want to go further without a professional job, look at this: