Hello, I use Por15 regularly with great success and no problems in ten years. Think the problem was spraying which as I recall the manufacturer does not recommend. Another thing I have learned is " never take the can lid off". Punch a small hole in side as high as possible and a hole 180 degrees opposite in the top for a vent.Pour out only enough to use with in ten minutes max. and Install sheet metal screws in the holes imediately. When and ready to return the can to the shelf, with screws install, invert the momentarily to seal the screws Por 15 will last for sveral months at least when store this way. It works for me--Paul
