I have a new asphalt driveway that I want to seal. I also want to seal/paint the garage floor. Which should I do first? The garage floor was painted many years ago and most of the paint is worn off. I suspect that I’ll have to use muriatic acid or something similar to remove the remaining paint, clean and etch the floor. Will the muriatic acid harm the unsealed driveway? If the driveway is sealed first, will the muriatic acid damage the sealer? Which should I do first?