Certain jobs like these custom Nerf-Bar/Rocker Guards have areas that can not only trap moisture but also not receive full powder coverage when coating. These tight areas can develop corrosion that will eventually work its way to the visible surface areas compromising the long-term durability of the powder coating as well as the overall aesthetics of the job.
In some cases, using a high-temp rattle can paint can protect these hidden areas, giving the part full protective coverage. Applying before sand-blasting and outgassing will insure that any excess spray is removed during the sand-blasting process and only the hard-to-reach areas are pre-coated. Plus, the high-temp resistance of this spray-paint will allow complete oven use without outgassing or peeling from the part prior to coating as well as withstanding the curing process.
