About the only brush painting I do anymore is small details that are molded into larger parts that I have airbrushed with lacquer paint. When brush painting, I have been using the old fashioned Testors square bottles, because they brush and cover really well. The other advantage to using those for brush painting details on a larger part that has been painted with lacquer is that the solvent in the Testors paint is pretty much completey harmless to the lacquer. So, it doesn't cause the lacquer underneath to start lifting. Also, any mistakes you make can be removed with a Q-tip dampened with paint thinner, without damaging the lacquer underneath it. Just one coat of Testors usually does the trick.
Liquid maskers I have found to not be good for much other than filling in areas between where you have applied paper masks to something like an aircraft canopy. You just can't get a sharp, clean edge using a liquid masker. I don't like using tape of any kind for masking either, because it is often too thick to lay down properly, and also quite often damages the paint underneath by leaving a residue or slightly altering its sheen. Any masking I do now is done with Tamiya masking sticker sheets. They're nice and thin, so they lay down really well, and they don't do any damage to the paint they're applied to. The other advantage is that the adhesive that's on them is just the right amount of aggressiveness and it stays that way, so they're infinitely repositionable...letting you get your mask in exactly the right spot.