i've used 1200° ceramic paint with all the proper steps to prepping & cleaning and it eventually bubbled in the corners and crevices after 6-8 months. http://www.duplicolor.com/products/engine.html
...paint acts as insulation and holds heat in so it will get hotter than if it didn't have that extra coat of paint, now I only use unfinished aluminum but powdercoating would be the only other option i'd consider.
and DO NOT DO NOT DO NOT sandblast the valve cover under any circumstances...i can't tell you how many people that rattle can a VC tell me they had that done, LOLOL....sand will remain in the baflles until the oil pressure pushes it out while driving, you will not be able to clean it all out beforehand and sand and valvetrain don't exactly go together
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