your E50 probably shouldnt get hot enough to fuck up the paint...
when me and nils lived in albuquerque he bought a cheap bead blasting/powdercoating setup and a small toaster oven. he powdercoated the engine cases white and it turned out great! only took about an hour too for the whole job. plus the case halves fit really easily into the oven.
personally, powdercoating just LOOKS better in a situation like that.