The best replacement for spray gun is roller.

The best alternatives to spray gun are rated as following:
★★★★★  roller
★★★★★  spray can
★★★  airbrush
★★★  paint roller
★★  suction feed
★★  hvlp
★  siphon feed
★  aerosol
  gravity spray gun
  suction
  paint brush

Your alternative for spray gun is not listed? Suggest!
Speaking about spray gun, one probably shouldn't forget about compressor.

Other search terms related to spray gun and their ratings are:
★★★★★ compressor
★★ pressure pot
★★ small compressor
★★ hopper
★ rustoleum
★ pancake compressor
★ air compressor
★ latex paint
You have in mind a companion for spray gun and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of spray gun in all years. Click on graph for more.
spray gun
roller
spray can