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Forget everything else except C5 or the nanolex equivalent.
Once on you'll never need to worry about re-applying mate for about 18 months maybe even longer depending on how they're cleaned. Forget the wax type sealants, they don't last at all.
15ml is more than enough to do 4 wheels, even when you over apply you'll still have left overs. I can't find it now but it's said C5 withstands higher temperatures than the claimed 300'c temp of brake dust etc
a full on wash, de tar, several hits to de iron with something like iron-x, then an IPA wipedown to ensure no oils or residues are left on the surface. Only then is it worth applying C5,