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Do I need a leveling coat of exterior plastering and is it an alternative to a final coat?

Our house is about to start exterior finishing. Our plasterer suggested applying a leveling layer over the top layer (mineral, country house style). Does anyone here have any experience? He said this coating protects against algae growth and makes the stucco really white. And then you won't need a painter's coat.

My painter is not very familiar with the leveling coat (he was honest about that) and said that it probably wouldn't last that long and that a coat of paint would be needed. Does anyone here have any experience? Do I need a leveling coat and is it an alternative to a final coat? 

• plaster
• leveling layer