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So do I sand it off with a scotbrite pad or treat it with Muratic Acid to remove the rust before spaying primer on it?



Well, sand for sure but hit it with the muriatic acid first. No way, no how is sanding gonna clear all the rust away from the metal due to pitting (as microscopic as it may be). So paint on some o' that hydrochloric acid (another name for) to be rinsed off later. Watch for the off gassing when the acid combines with the rust... this is nasty stuff on the lungs. And be aware that the freshly treated metal is extremely vulnerable to further oxidation so hit it very soon with a primer to seal it.

You will never get all the rust with sanding alone. If not treated it will re-appear later as bubbles under the paint... not something you want to face after all that work and money.

Live to love, love to live.