The 1615 duplicolor seals the pores and makes the manifold easy to clean. Mine has been on the car for a few years now and still looks good. It's also gasoline and Autozone brake cleaner resistant too. But the O'Reilly brand brakecleaner will remove it or stain it. The O Reilly brake cleaner works well for most spray paint remover!
For longer lasting use I prefer powdercoating. There are some colors that look like clean aluminum, then I tried clear powdercoat on freshly glassbeaded aluminum and didn't like it. Your choice.
TIMINATOR