Originally Posted by strelnik

. . . PLEASE do not attempt to clearcoat. The best way to keep the valve cover shiny is to remove it, clean it completely in and out, then use tooling or abrasive paper to rectify it, i.e. the same way that a telescope mirror is rectified to move all the molecules in the same direction on the surface, which creates the unified reflection of all light.

By using ammonia-based products, you insert tiny crystals of ammonia based compounds that get in the cracks and crevices of the surface. Over time, the heat and exposure to moisture activates these and actually eats away small amounts of the metal, weakening it. Simi chrome contains the seeds of its own destruction which are further added each time you use it.

Thanks,
S