This has been something I've had my own concerns about. Generally speaking, shortcuts are NOT the best way to go, however, combining primer and paint for interior use might be okay, depending on the existing conditions of the surface to be covered, and your expectations for the durability of that surface.
It's my best guess that they suggest that you prepare and coat the surface properly on the exterior because skimping on any part of the process is so much more consequential on the exterior where the surfaces are exposed to very harsh conditions as compared to interiors, AND they are covered if the paint fails: they can point to failure to follow directions. And they would be right: paint doesn't fail; it will adhere to a properly prepared surface. I think the paint/primer combo would be sufficient for certain limited exterior applications, and that the primer is in there, it just won't give you excellent results if you rely on the combo product alone.
If you do it properly, prepare the surface well, prime first, then coat with the combo paint, you will probably get good adhesion, since primer generally adheres well. In addition, if there is polyurethane in there, you should get very good adhesion based on my expierence.
Just a tip: thin coats are best. Thick paint will never properly dry, will wrinkle, and will compromise anything that goes on top of it, that's why they recommend two top coats. I worked in paint many years, and would NOT recommend two coats as a general rule. One light coat of a quality paint should do it, even on shakes; it just takes a bit of care. You always want to avoid too much paint build up, especially if you are living in a beautiful older home. Eventually, all that paint will need to be removed for anything further to adhere. Think about fingernails with coat upon coat of polish on them. Paint on paint just really has nothing to adhere to, so do it well, and reapaint as infrequently as possible.
Christine - Mpls
--- In DoIt_Yourself@yahoogroups.com, subprong <subprong@...> wrote:
>
> Curious about a paint product. I think it's called Valspar's Ultra Paint +
> Primer. I figured this was a primer and paint combination. No need to buy
> primer. I read the instructions which suggests exterior primer and two
> coats of this stuff. I must have lost something in translation. Am I
> interpreting this incorrectly or is this a gimmick.
>
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