In your case it would likely take quite a while before there would be a noticeable difference in the RustSeal alone, however we would recommend our BlackTop be applied over the areas that may see prolonged sunlight exposure. You can however apply any topcoat over the RustSeal it's just critical that you apply these other products before RustSeal cures completely (within the 3-24th hour).
You can find complete instructions for RustSeal here: http://www.kbs-coatings.com/RustSeal-Information-and-Instructions_ep_38-1.html
You can also find Instructional Videos here: http://www.kbs-coatings.com/KBS-Videos_ep_90-1.html
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