ok, want to get the bottom of the s2 lookin very clean and tidy, body coloured, but also want it well protected

wot products r best to use??? the underseal is stripped, so wil b pretty much applied to bare metal.

want it protected so i dnt have to do this agen for a few years, and dnt want rust building up thru lack of protection

also want to do it body coloured, to match the white respray, so wot paint best for this???

any help appreciated