Regal Flat Coverage
Regardless of whether I was using the product in the 1990s or in 2022, the coverage has never been an issue.
We painted at the Smithsonian for a several years. With each new exhibit, there were always dramatic color changes. The required paint was Regal Flat or Eggshell. Whether we changed from dark colors to light colors, or vis-a-versa, the paint covered in two coats.
FYI – yes, some paints cover better than Regal. I tested Regal Flat against Behr Marquee Matte, and Duration Matte. Though it still needed a second coat, it will give you the best chance at one coat coverage. See examples below.
However, if a paint covers in two coats, I give the coverage a 10. If I was to compare the coverage to Behr Marquee Matte, I would give the Marquee a 10 and Regal a 7.5.
Regal Flat coverage scores a 10.