On Mon, 04 Jun 2012 22:05:04 -0400, Bill wrote:

BobS wrote:


"Sonny" wrote in message
...

Specifically exterior house painting: I'm confused and/or my knowing/
assuming is defected. I have generally thought any paint can be
applied over any primer.

I used Zinsser Cover Stain oil base primer, then applied Sears
Weatherbeater (Latex, waterbased) as a top coat. I am having some
peeling of the top coat.... applied within the past 5 years or so.
Are these 2 coverages, Latex water based topcoat over an oil based
primer, noncompatible, and that's why I'm having this peeling? If
so, ....

What topcoating should I be using over the Zinsser oil based Cover
Stain primer, for exterior house painting?

Sonny

The primer needs to be "whole house primer" and not spot primer. If you
used the spot primer before, it contracts and expands at a different
rate than the top coat paint. When that happens, you end up with flaking
paint.

Also, moisture getting behind the wood will also cause flaking.

BobS

What is his course of action now if he has these incompatible layers
already on the house?
A LOT of sanding??? or scraping.. Or both.