rust proofing a 2011 Scion

I would not recommend going for the dealer's very profitable rust proof treatment.

I get my car done at Krown every year. I also use a $15 dollar discount coupon that my mechanic gives me every year too.

My cousin swears by Rust Check but it's cheaper (you get what you pay for?).

I don't know about buying cans and spraying your car yourself, except for touch ups. I think you can also buy cans from Krown of their product for touch ups.