Painting Without Removing Engine

I did my engine bay with a brush, thinner, oil based paints, etc... came out ok, and not black.

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Also for the inside rails, I sanded the inner part of the fender with 600grit and then brushed a clear coat over it, cleaned with #0000 steel wool, and then polished. It looks almost identical to the newer paint outside the car.

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Maybe you can do the underside by hand, and the harder to reach areas, then shoot the rest.