I'm racing though so what do I do for painting with bittydesign liquid maskIf it's a basher then as little as will get the job done. Thick paint jobs chip in high stress areas.
My RotM entry was never touched with a hobby knife, I tape everything old school. The key to it all is being patient and taking your time with the masking.
What is the name of your airbrushFor applying the paint mask, I brush it on thin on the first coat. Then I apply a second coat. I like the mask that has a blue tint to it so it's easier to see thin spots. If yours is clear, you can put a drop or two of food dye in it to make it show up better. I have always wanted yo try to get my airbrush to spray the mask on, but have yet to try it. It would need thinned a lot to spray though.
When cutting, use a brand new blade. It doesn't take much pressure at all to score the mask enough to get it to peel up along your cut lines.