I wanna see some flat black dusters or rat rod dusters

Here is the results you can get if you spray Ace Hardware paint thinned with mineral spirits.
This truck was my daily driver for many years and still would be it I did not wreck it.
If you use spray rustolem buy the professional grade and thin with acetone.
If you roll then use mineral spirits.
I have seen the roller jobs and they look great but are very labor intensive. Remember with roller paint you will also have to buy a buffer.
I would spray it if you have a gun and compressor.