I'm just trying to do the same thing, so I'm very interested in this, but also got something to share.
http://stephanius40k.blogspot.com/2013/09/masking-practice.html
Tape provides quick and easy straight lines, but needs to be pushed into the surface to follow it well enough and even then it won't be exact. Still, I found that for jetbikes it does the job.
Tamiya tape is very good, but I used up some other tape here. I used (red) airbrush masking tape for precise lines and blue tape for area coverage.
Both are supposed to release easily, which is important. Even though I used the right tape, I had a little bit of paint pulled up on one model when peeling.
I'm guessing the paint wasn't really dry yet when I applied the tape or I pressed it down to hard trying to avoid leaks.
Let the paint you stick between the tape dry really well. You don't want a bit of paint to stick to the edge of the tape and then be spilled when you lift the tape before it is dry.
I've used liquid mask for gems in my test, but
RC car guys use it as area coverage and then cut out the shapes they want with an exacto knife and peel the bit they want to paint.
That technique might be transferable to our use and of course the shape of the surface doesn't matter with liquid mask.