Has anyone come across a concrete subfloor that is so porous its just sucks water or primer clean away. I had one recently where I had to really wet it down before hand but it still caused the latex to pinhole where it was drying too quick.
In this weather the top surface will be much drier than normal due to the heat and evaporation. I've had a couple recently and got round it with a very wet diluted prime ( basically wetting the floor a lot) followed by a regular diluted one.
