All my hand, you mentalist
If you're any good on the computer and can use vector based programs like Illustrator, Corel Draw or the completely free InkScape get yourself a cutter and some masking vinyl, so much easier, all your lettering and big shapes can be done with it. That said you have to faff with tape over the rest of the body and the masking film won't always conform to the shell shape, it's worth looking at though as you can have the best of both worlds then, liquid mask for general coverage and the cutter for neat super cool logo's and stuff.
Some where further on in this thread is a think all about cutters if you search through it.