no clue, but malice bought a set of Brembo rotors from race concepts and so did I the rear ones, and they still haven't rusted. My Front rotors I bought elsewhere and they rusted. so no clue if zinc coated is worth it, or buying a good set of rotors.

 

ive got brembos' , cross drilled slotted... i bought them on ebay ... for 230 shipped... he is usally selling fronts and rears, i got lucky and got all 4 for 230.... they are incredable... much better than stock... and they arent rusting just yet... everyone asks me that question.... but they are great..

 

how long have you had them?

 

rust isnt really a problem since the brakes heat up and cool down, when they sit still the brakes rust, and for too long can ruin them...

 

Well the rust in the holes of the cross drilled can be an issue because that leads to cracks sometimes because of the weakness of the metal at that point.

At you are right that if you let them sit too long, they will warp.

 

ive had them for about a month now... they are great... when i come to the car after a rainy day they are rusty as sh*t.. just drive it for a few and its all good... i dont let the rust sit for long... since i got 17" ... they look great with rims...