Home Depot sells a Behr Premium Plus Ultra paint that in a single can
combines a primer with the finish coat. (May be other brands out there,
too.) While the concept is certainly attractive, can we expect it to
work as well as separate coats? The literature touts nanotechnology in
the formulation. What about proven durability? (Since nanotechnology is
so new, I wonder what kind of accelerated tests the paint underwent to
simulate real world conditions.) Anyone have first-hand experience with
this product or other similar ones?

I'm planning to paint the outside of my home. Most of the shingles are
asbestos, the others are wood shingles. Fascia boards are a mix of real
wood and pressed paper! (Thanks, Levitt and Sons.) The soffits are a mix
of pressed paper and exterior and interior plywood. The house was built
in 1967 and everything has been painted many times, except for the
soffits and fascias that I replaced last week (with real wood).

For the curious: Those pressed paper fascia boards and soffits are
dimensionally identical to standard wood sizes. If all the previous
homeowners had kept them well painted for the past 40 years, they would
have stood up to the elements remarkably well.

Thanks for your comments.