No primer needed just use 800 wet and dry with soapy water to flat the panels ie take the shine off then put a few coats of the yellow base so all the panels are the same shade. The next layer which is the pearl is very transparent so give each panel the same number of coats then it's the clearcoat.
I would say 1ltr base 1/2ltr pearl and 1ltr clear. You will have some left to repair any issues that may happen.
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