I have purchased but have not used the ZOOPS sealant kit. It is mixed with a liquid and then applied after a polishing. What I do use, is the metal sealant that Wizard Products sells. I have used that for several years without any issue. By saying that, I had Billet Specialty polished rims on my daily driver, which was seeing a lot of miles during the months without snow. I admit for months with really bad weather and salt on the highways, I ran an old set of wheels to ensure that my billets stayed cleaner. My son now has the Billet Specialty wheels on his truck and I still have a set on my show truck. I clean the wheels once a year and apply the sealant. I also do all of my aluminum parts on my engine and in my truck cab with it.
As for spending $20.00 for a sealant, this stuff is around $12.00, but if it works the price is no issue.
http://www.wizardsproducts.com/store...5&cat=0&page=1