Thought I was following the directions - removed the top tab as directed - but no matter what I try I CANNOT get any pressurize air to come out of the container. For me at least this can was a waste of money! (And I still don't know if my keyboard is fixable!)
Did seem to dust effectively for a generic air duster but I haven't had it long enough to test how long it will last. They have gone up in price tremendously no matter what brand.