Norminn wrote:
clipped

Primer is a waste in this situation. Two coats of paint cover most
colors. Three for drasticly different colors. If three coats of paint
are needed to cover a color, then three it is. Primer doesn't cover.

Are you missing the word "blocking" in the phrase "blocking primer"
accidentally or intentionally?

A blocking primer, as I understand it, keeps stains and some wood
pigments from bleeding through into the PAINT coating. Has nothing at
all to do with whether the paint that goes on after it COVERS the
underlying color. Entirely different issues.

Most stain blocking primers don't mention their hiding ability as
they're primarily sealers and don't hide all that well.
http://www.benjaminmoore.com/wrapper...art=7.4.2.2 6
There are a few stain blocking primers that have improved hiding
ability. Zinsser makes two - High Hide and Deep Tint (although this
one relies on added colorant to improve the hide).
http://www.zinsser.com/subcat.asp?CategoryID=1

R