Model Air does spray out of the bottle. I use a Badger 105 at 12 to 15 psi. You can tweak the paint flow if needed with some Vallejo Flow Improver or Thinner. If it’s old and has been sitting thinning may be necessary.

Model Color is Vallejo’s paint formulated for hand brushing. It can be thinned, I’ll use the thinner or flow improver at 3 or 4 parts paint to 1 part thinner medium