Mike I buy these in bulk when they are an sale for under $7....and I use them as disposables for clear and colored dope
I used to try and keep the tubes and spray nozzels clean but too much grief...
The Nozzels are NOT good for fine detail and you must thin 50% or More in my experience to prevent sputter
I much prefer these to the 1" sable hair brush for doping large areas....just faster for me
Bottom line I like them for projects that setting up the HF compressor, line, filter, detail gun...is sort of a PITA --and then I am obligated to clean the gun...preval sprayer with 1 oz left over...in the trash...done!