Depends on the brand and type of product.� I painted as a "pro" in high school.� My favorite paint is PPG, the PPG epoxies are certainly weatherproof, I use DP90 as my flat black of choice on wheels, and have some in service for 15 years.� Similarly their then acrylic primer sealer something like DAS or DP 1980, I forget, and forget the replacement product was weatherproof.� Most primers alone soak up water though and are not.
�
John

--- On Wed, 10/14/09, Florian Speier <groups.florian@GMAIL.COM> wrote:

From: Florian Speier <groups.florian@GMAIL.COM>
Subject: is primer/sealer weathertight?
To: vanagon@GERRY.VANAGON.COM
Date: Wednesday, October 14, 2009, 5:32 PM

A few weeks ago I did my seams and surrounding three inches, at the typical
rust spot where the camper stuff is welded in on the drivers side. I ran out
of time after applying primer/sealer and thought thats ok to wait a while at
this stage.......
now we had two days of solid rain, and I have micro bubbles under the primer
about an inch away from the seam, and worse, something slightly rustcolored
at a few seam spots.
Obviously I have to redo a few things, but I was wondering whether my
assumption that primer sealer is weathertight was wrong, or if I did the
whole thing wrong......

thanks
florian