Depending on how much clear you have on it anywhere from 2 weeks to 3 months. If it's UV and you have buffed it and can't see a thumbnail imprint in the clear (if you press your thumbnail down on the clear) then it's "safe" to mask it. Keep in mind you want to get the masking (tape, plastic, paper, it's all the same) on and off quickly. Ideally no more than 6 hours. Never leave it on overnight or any longer than absolutely necessary.