vorgath,
In my experience using the airless gun with thinner paints, primers, and stains etc., I get a lot of dripping out the nozzle of the gun. One solution is to keep a rag close at hand and wipe it down every couple minutes. Just be aware this can happen...it can get quite irritating.
(Maybe the newer models are better - it's been a few years since I've used my Wagner to prime a car.)
Dewey