Defined: Concrete slab outgassing may cause fish eyes, craters and pinholes in the coatings. Outgassing is caused by air trapped in the voids of the concrete, and when the temperature rises, the air within the concrete seeks equilibrium with the surrounding air, you get outgassing.
Solution: Rough up coating with 60 grit screen or sandpaper to remove large craters and fish eyes. You may need to fill the large holes with more material. Clean and vacuum and apply another coat. If over the 24 hour application window, sand the entire floor before applying the additional coat.
Avoiding in the future: Apply Epoxy-Shell WB 250 or 50 as a primer. Or apply when when the surface temperature and air temperature are in a cooling cycle and avoid applying any products in direct sunlight.
