little help with the AB!

Tip dry is a way of life with acrylics and while using retarders and so forth helps there is not much you can do to eliminate it IMHO.

I suggest you become used to picking the paint off the needle tip with your thumb and fingernails as T-shirt artists do all the time. It keeps the needle fairly clean and allows the paint to flow better.

MM Acryl is notorious for tip dry. Get some Liquidtex or Createx Acrylic retarder and put a drop into the thinner you use, then add to the paint. Should put an end to tip dry.

Just in case though, keep a little cap of Windex and a Qtip handy. When not spraying, swab out the regulator (pull the needle back first) and tip dry should be nothing but a bad memory.

You can dump the paint down the drain, that's the nice thing about acrylics. Soap and water wash up your hands.