Originally Posted by Yeti
The wall was previously painted but needed a few patches so I just primed the whole wall. The primer isn't pulling off thank god, just the paint. I had a similar problem on another wall that I spot primed, it was like the first coat of paint didn't want to stick well on any of the patches. You could see everywhere i patched and it looked as though i missed the spot with the roller completely. This now makes me think it's an issue with the primer. I generally shop at BM, do they have a good drywall primer?
I'm not sure we have enough info to either identify the problem, and to make a better recommendation...You mentioned in your first post that "the roller is pulling the paint back off the wall..." How do you know this? Do you actually see the paint lifting from the surface as you roll back over it? If that's the case, there are 2 distinct probabilities as to why...(1) technique - rolling back over the freshly applied paint after it has had enough time to start to "set up". If you're going to roll over a freshly applied film, do so while the paint is still wet - not after it's had a few (or several) minutes to dry. (2) If you can see the product "lifting" from the surface as you roll over it (and not because of what's described in #1), that is a tell-tale sign of a cheap roller cover. Believe it or not, there is a lot of science that actually goes into the design and performance of roller covers. If you watch a slow, and magnified, application of paint by roller, you'll see the fabric tries to pick the paint back off the wall after it just lays it down...a good fabric holds the material for application, but releases it without add'l pick up of film once applied. An inexpensive fabric, by design or inherent property of the fabric, may hold paint fine for application - but then lift it back from the surface as it's rolled back over a freshly applied surface. AND, that's going to be a more frequent experience with all the new blends of resins...
OK, so lets say it isn't any of that...I asked you how you knew it was pulling the paint back off the wall - you later spoke of this happening before when you spot primed a wall and and "it looked as though i missed the spot with the roller completely" - That kinda describes flashing, more so than what was described earlier. Now, if that's the case (in both situations), that leads back to the primer. Few companies know more about drywall (wallboard, sheetrock, whatever...) than USG...and now USG has become a paint manufacturer - of sorts. It seems with their knowledge and expertise of wallboard, it'd be a natural for them to deliver the best primer for their own manufactured product. Right?
USG's primers aren't exactly the same as primers made by paint companies... they are different - and USG makes that claim in their printed data. While most
primers (as manufactured by paint companies) are designed to seal,
and therefore,limit a surface's porosity (thereby not allowing the surface to absorb all the vehicle out of newly applied paint)...(and thereby leaving a paint film with partially unbound solids - which is not a good paint foundation)...USG's primers are designed to level the porosity of the entire surface to be painted. Sound the same? It's not. Paint companies primers seal a surface to limit porosity and minimize flashing, USG's products actually promote flashing - but on a more uniform and continual basis, since the entire surface "primed" with USG is of equal porosity. Did that make sense?
Of equal concern is that Calcium Carbonate is the primary filler for USG's primers (read previous posts as to what problems may occur with calcium carbonate laden products). The USG product is kinda sorta like a poor man's skim coat, but by roller instead of trowel...and there's very few painters in this here forum that'll not recommend priming a skim coated surface prior to painting (but not with the same thing used to skim with)...
There are many, many good primer/sealers out there. USG's product is not a terrible product, it's just necessary to know what it actually is, and does - a paint store (as opposed to a box store) should've been able to walk you through this experience with the proper primers, tools and finish for your app.
I hope there's something in all this rambling that is helpful to you. Good luck and let us know how things turn out.