Doing the same to the Eqinox and have done last 10ys when i change tires back to summer. Like u i just use Tremclad rust paint that's been sitting on shelf so cost is 0.00 and 15 minutes of my time. Find it holds up just fine....may splurge and spend the $10.00 to go yellow or maybe blue for the illusion of high end brakes on the beast...........