Satisfactory
Tito,
Michael's on the right path. You've heard the adage "fat over lean"? Well, by starting with a fat base (per your description) there's nowhere to go but very fat from then on. Otherwise what WILL happen in less than 60 years is the new paint will crack off.
As far as how white your base, who cares? You're about to go grey with everything before going to the final colors anyway right? Thick rich color doesn't care how white the very base is anyway, no matter what you read. Thick opaque pigment painted over grey underpainting will not reflect how white you started.
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