it is not going to rust for a long time. Unless you sand blast it to bare metal and drive in a salty mess.
You have a rust through policy from GM, and it might be the 4 year, I am not sure.
These trucks are not like the late 80 toyota, and subaru's...those rusted. The metal is much better now than it used to be in the 80's. Also the way they attach body parts is better too.
In VT many people use HOT oil undercoating, and even spray it into the rockers. I am not a fan of that...so I pressure wash it in the spring, and get all the junk off. I will not be undercoating it.
There are treatments you can use, and some are spray on, some dealers do this. A company that used to be around back in the day was "rusty jones" and I am not sure they are still around...google can tell you that.
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'05 Stealth Gray SUT
A Mellow Mix of Black & Bling
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