Based on your experience, which size of micro-brush (regular, fine, super-fine) is the most useful?

In my experience all the 'fuzz ball' brushes are very useful and the black (?) regular style bristle type brush is much less useful.

I use the yellow, white and green brushes to clean the interior of my Tamiya airbrush, and the largest (yellow?) to put Tenax inside the fuselages of 1/72 a/c.

My US$0.02
Mike

I guess it really depends on what you use them for, but for me, I’ve found the fine and super-fine get used up first. I use them mainly for touch-up paint jobs and in weathering small objects. I dip them in mineral spirits to clean them afterwards, for re-use. Once the “fuzz” wears off, the small plastic tips make good applicators for CA in tight spots.

Mike