$25 for a 3" brush sounds like a government contract - I'm sorry, I also need a $175 putty knife and a $550 hammer... (Yeah, I remember those "mandatory state contract" prices, available from ONE vendor, and they own you.) Of COURSE they have a NSN on them... it's in the spec on the contract!
I match the brush to the paint and the surface. I'd go with a softer bristle as for me it gives a smoother result.
I also spend a lot of time cleaning the brush out when I'm done using it. And they keep coming back for my own abuse.
We had Light House for the Blind and Skilcraft.
The spray paint was so terrible and a can was like $12... (in 2005 dollars)
It was like watercolors in a spray can. Anything more than a hint of a coat would run, and it took about 17 coats to actually color something
We often bought hardware paint and kept the Lighthouse out for any inspectors as the Krylon or whatever wasn't approved for use.
Oh, got a case once that has yellow caps but was red paint, and a case with the labels all upside down.
Had a chuckle at that. Figured someone working there to GC would have had vision.
The duct tape wasn't any better. It was so ****, it would barely even stick to itself.
During a bomb build the crew had to tape down the lanyards (it's what hook to the aircraft to pull the arming wire)
So they're out there with heat guns trying to warm up -10* bombs to get the tape to stick
That **** wouldn't have even stuck on a 70* day and the bombs coated in carpet glue