1/25th Camaro quickie and another of the GTO

[mlomaka]

You can try 24 hours, but a lot depends on what you are going to mask it with. The stickier whatever it is you use, the longer I would wait. Personally, I would give it a couple of days. I have also found that the thinner the masking, the smaller the ridge. I have some of that bad "super bright" Bare Metal that doesn't really stick well enough to use for detailing, but works great for two tones. It leaves a very little ridge. Take your time, you don't want to mess up what you have already done.
Here are a couple I did using BM.



Be sure to show us pics after you do it.