You forgot the pointless "LOL POLLWHORE" option.. If adding a poll at least let it have some relevant bearing on the thread.
In regards to your question, you brush it on, CLEAN THE BRUSH well afterwards, apply other paints where needed and finally when everything is dry gently rub the model with a DAMP NON-FLUFFY RAG, thus removing the liquid mask. This can also be done very carefully with tweezers.
Granted this is the case with the Flames of War Utility set, which uses Vallejo paints and whatnots.
Pictures:
Apply goo.
Apply other paint.
Remove goo.