Painting, at what temp?

[pipoman]

6. The Sherwin Williams people should know..

and I am no expert in house paint. I do know a bit about automotive finishes. If there is a an adhesion problem with the paint on a car, it cannot be fixed for the long term without sanding below the layer of finish which isn't adhering. If you paint over the existing paint, the new finish is only adhered as well as the base coat. I don't know if non-automotive primers/paints have the same properties? If I were going to paint the old basement in my rental house, someone would have to give me a reasonable explanation for why one product or another would be stable over a base which I knew was not stable...there certainly could be a product or explanation, without one I would have probably rented a blaster and removed as much of the old surface as possible, then treated the base surface with a product or procedure which would enhance adhesion..

With automotive finishes, which admittedly are much more complex, everything effects the adhesion and/or finish quality...temperature, humidity, barometric pressure, air quality, ventilation, etc. There are procedures, products and formulations available for almost any conditions which mitigate the chances of an undesirable result.