Another long time contractor suggested that I spray 2 or even 3 coats of primer, since spraying lleaves less paint on the surface. I am new to.
You only ever need 1 coat of primer. Many times you'll need 2 (or 3 or even more) coats of paint to get good coverage, depending on the color.
Is primer required for a job like this, and if so how many coats of primer should or high-build drywall primer-sealer (e.g., KILZ High-Build Drywall Primer Sealer.
KILZ® PVA DRYWALL PRIMER is a fast drying, interior latex primer made to prime new, uncoated drywall and reduce the number of topcoats required to achieve a uniform, professional quality finish. 4☆ stars, 2 2 reviews with 4 stars . . You can't use this over any other paint (regardless of whether it is glossy or flat).
what you need is a PVA primer.. it is used for new drywall. Or a paint marked Oh, and Friends Don't Let Friends Use Kilz2. Just stay away, no.
If you are going to paint the walls any PVA primer will work, 2 coats. If you are planning on wall paper 2 coats PVA primer and 2 coats Kilz.