Well if you're a front, then you kinda stay in your bunker till your back tells you to move..As for crap coming outta your bunker, I myself like to walk into lanes of paint all the time, lol! And if you're a back you get to scream loads, it's a win win situation..
Just a bit of time and practice and I'm sure you'll rock the field like my teammate! (with me watching her back, of course..)
If you're gonna come out of your bunker, first make sure your back says it's OK to move, or if you're the back, snap your head out really quick to make sure no-one is shooting at you. Even if they are, wait for a lull or pop out somewhere they aren't aiming at, fire loadsa paint at them while checking no-one is looking at you, then run to your next bunker. Keep firing at them, and there's a trick, if you stop shooting about halfway, then get into your bunker, they think you're still in the last bunker. Then you run forwards and bunker them...Best feeling ever, lol!
I'll get my teammate on this forum and she'll tell you. She likes shooting me in the back when we play one-on-one..