I have a sealed concrete floor in my garage. I moved in a few months ago, not sure how long it's been since it was sealed. I wanted to do something decorative to the floor. But because it is sealed I can't unless I remove the sealant and I don't want to. I thought I would wait until it was in need of a re-seal. But now I am reading that a concrete floor in the garage should be re-sealed every year, is that true?