Can I use any spray painter for interior walls. Or can you reccomend one ? thanks

This is a stainer, not a painter. Wagner sells many good painters, but the best method is still to roll-on in my opinion. If your doing a barn or something a sprayer might be ideal, or fence painting, etc..

The Opti-Stain Plus will not be able to spray a latex paint, it is simply too thick. You will want to look at our PaintReady line of units for a low-cost option for painting interior walls.