I find that if your using vinyl or window masks paint build up is greater than liquid mask, if you use vinyl a light run down with the scalpal does the trick (a pain it its a long twisty area).
Liquid mask providing you have a sufficently thick coat doesn't build up the paint really so it doesn't tend to be a problem but like jon said make sure you have let the mask cool after drying before removing it. Otherwise its a little rubbery and stretches rather than just peeling.
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