Rudy if it's high build primer 2 good coats will be fine. If it is standard aerosol primer 3 will be necessary. Remember also there is no need to prime the entire surface, just spray along the line of the tape, the fan overspray will feather nicely.

Attached not on my web site but shows the clarity of 3 coats from a can!

Good look.

PS mark out both top and bottom wing before you apply the tape. I did top and bottom separately and made some minor errors in alignment.