On a cheaper route, but simple, the sealant types like Jescar Ultralock Plus, Meguiar's M27, and Wolfgang si02 Sealant give nice gloss and some durability. From a retail anywhere point, Meguiar's Ultimate Liquid Wax gives nice shine and is available a ton of places. And if you wanted to upkeep that easy, top with Ultimate Quik Wax whenever you want after a wash, very easy spray and also available everywhere. All easy on and off to work with.