Fozzie, not sure if you got that new gun yet - but thought you might want to check out a post I made regarding some factors to consider related to some other posters airbrush questions - and so you might also realize there is another exceptional brand of airbrush to consider that offers superior performance features and is less costly. Kosmonot out. Jneilo, Not an Iwata guy - but do know that the tip size you choose on any brand is not the sole relevant factor of how fine it sprays or how well it sprays a given medium. Fine, Medium, Large, .21, .35 or 1, 3, 5 do not only pertain to the tip size as far as which you should choose and use, in fact they tend to apply more to the medium type you are spraying. Yes, the finest tip will allow the finest line but it will only do so consistently when sprayed with the proper medium. You can get most taxidermy paints to work but you must do some thinning for any consistency in that regard. I use a Badger 100LG with the fine tip (.2) and more recently a Badger Renegade Velocity with the ultra-fine tip (.18), but I am always certain my paints are the viscosity of 2% milk or finer. If doing this I never have probs and get tight hairline detail from these guns. The other thing I have seen to make a difference is the linear air flow angle to the tip of the needle - this was actually expalined to me as what detrmines how the paint actually leaves the needle. The tip size determines the partical matter size that can exit the nozzle, but the linear air flow angle determines how fine the line pattern is once it leaves it the needle and exits the paint tip. So the lesser the the linear airflow angle the tighter the line. This is why I have gone over now to the Renegade as the linear air flow angle is a full degree less than the 100 (and the Iwata HP series as well for all you Iwata hounds) and thus enables tighter lines with no additional user skill. By the way - this new gun also comes with a factory carbide polished needle which even further tightens the line pattern. Anyhow, being a "proud to be using an American product" guy I figured I take this opp to help with your question and plug something excellent made here in the States that doesn't seem to get much due consideration from this forum. Kosmonot out.