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I've seen this stuff long time ago and supposedly it works. BUT I dont know how well they'll stand up to heat. You should email/call them about it. They may be okay with LS400 calipers (they dont get hot after driving), but the OEM iron/steel caliper gets HOT.
I just googled around. Looks like they aren't as great as I thought they would be. Many say it just looks like a more reflective silver paint than chrome. Plus the cans are expensive at $40+. You might as well spend a bit more and get them chrome dipped. At least it'll be more durable than paint.
you could just have them powdercoated..
powdercoating can give an appearance VERY similar to chrome, plus is a LOT more durable than paint when applied right.
I was reading some reviews on HIDplanet, guys were using this stuff to paint shrouds and they said what someone above said, its just a little more reflective than silver paint, but not close to chrome by any means.
Remember one thing it's spray paint and what does spray paint to crack, peel and chip very easy. Good luck but at $39.99 a can I will pass on this one.