There are several brands of liquid mask out. Your results may vary depending on just how "tiny" the shapes are you'd like to mask.
I know that Ambroid makes a liquid mask, and so does Micro Mark. I've used Winsor & Newton's masking fluid with great results. Not sure about the first 2, but the W & N is basically latex thinned with (I think) a little ammonia. It cerainly has that ammonia smell to it. It dries quickly and I haven't had any difficulty peeling it off after using it.
I find your lack of faith disturbing. . .