Watch out for oil as a contaminant in many air compressors. These days I use an oil free compressor for most things and don't really worry too much.
Back in the day I would run an inline sintered filter when spray painting. Spraying will show up contaminants pretty quickly in the finish and it was easy to see the difference the filter made.
If you want a cheap solution from Bunnies I'd suggest using a garden sprayer with a hand pump. A 5L jobby will set you back around $10 and can always be repurposed if needed. Add a thin straw as the nozzle and you're away!
Environmentally friendly and pretty quiet during a late night refill.
Clear skies!