Well Ed, the sealer is part 2 of the "X-Treem" kit. It works like wax on your paint or Rain-X on your window. It works really well on aluminum as that is what it was designed for. Sealer provides a minumium of 1 month and up to 3 months of protection and requires no additional maintaince above routine washing of your Hummer. I have tested this on my aluminum rims at the mud pits and everything else comes out covered in muck except my rims and people are amazed. James
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