2003 ZX5 and got headlights looking almost like new again after much sanding and Plastix. After about a month, the yellow comes faintly back. Plastix again and yellow again. Now figuring the lens have to be sealed. Used some NXT. Yellowed again. It is insane to have to keep up with these lenses every month as they gradually yellow over and over. Has anyone put a clear coat on the lenses? Will Lamin-x seal them or will they yellow under the Lamin-x?