Restore popcorn ceilings to 1960s luster

Primer, airless paint sprayer among must-haves

Q: I have a popcorn ceiling that has been stained a rust and oil color when a cast-iron pipe leaked. The ceiling is more than 40 years old but is still in perfect condition. I don’t know whether asbestos was included in the ceiling material.

My questions are:

1. Can I use a stain blocker primer on these stains before a color coat that matches the popcorn color?

2. Should I apply the new paint with a brush, roller or sprayer?

3. How do I cover the stain without brushing off the popcorn material?