I appreciate the kindness, but I'm from Brazil, and would be complicated ...
Could try to explain to me by email or indicate that some luthieres also use this product 610-1407 nitro?
In Brazil, say that they did not pass a basic sealer, then you should spend 10 coats of this product. But if you spend sealer coats believe would be less.
Between coats recommended in Brazil, spending 800 grid sand paper, however, I believe that you can achieve better explanations with you or a luthier indicated by you guys.