I used Sharkhide on polished alum wheels I had on my 97 Yukon. Definitely sealed them well. Held up to the nasty crap they spray on our winter roads in Montana. Only downside was it knocked down the shine. Still looked good enough for my daily driver but I chose not to use it on my 71 show truck. I used a product called Chrome Guard on them last summer. Did my full polish on them first. Then sprayed with Chome Guard, let dry, then a quick polish up with microfiber.
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