pH: Definition and measurement units. pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water. Water that has more free hydrogen ions is acidic, whereas water that has more free hydroxyl ions is basic. Since pH can be affected by chemicals in the water, pH is an important indicator of water that is changing chemically.
sealing a cinder block wall. I just finished sealing the cinder block wall in our basement with Baer waterproofing paint. After the first coat I noticed little orange rust colored spots in one corner of the room. Nice fresh white coat of paint, little spots the size of peas on one wall.
To properly paint over wallpaper, begin by securing any loose corners with wallpaper adhesive and evening out the seams with drywall mud. Once the drywall dries, sand it smooth, wiping away any dust that lingers behind. Cover the entire surface with an oil-based primer to seal the surface. Once the primer dries, apply oil-based paint. Water-based primer and paint can reactivate the wallpaper glue and cause the wallpaper to start peeling off. Oil-based primer and paint help seal wallpaper adhesive.