best sealants I've ever used are between Optimum poli seal, Wolfgang DGPS 3.0, DP sealant, Menzerna's new sealant as well. Each one is great in its own right but these have outlasted any and all of my expectations. Give one a try, just make sure you clay first and if you can polish do that as well to have the best surface for the sealants to bond to.
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