There may be a lot of covering and masking with spraying
All the overspray and bounce back will eventually drop to the floor, on any objects (uncovered) in the room, or down below on exteriors. Everything must be covered in the vicinity of the application (and downwind on exteriors). Protect from direct overspray and indirect (bounce back etc..). A good rule is: if you don’t want paint on it - then cover it. So, you must weight the masking off time and clean up time of the sprayer itself when done vs. the time saved using the high production of spray application.
Spraying and “The Minimum Threshold”
In general, for an airless rig, most painters won’t “break out” the sprayer unless they are going to apply a certain number of gallons of paint. This would be the minimum threshold. I would put that number at somewhere around 15 gallons of paint, anything less - roll. The time saved spraying will not be offset by the time masking and cleaning up for smaller quantities of paint.
Wind
Exterior spraying should be done with caution. The suspended overspray will carry a L-O-N-G way with the wind and air currents. The higher up off the ground the spraying, the farther down wind the paint will travel. You don’t want to speckle the neighbors house with your fresh paint color (I think they will figure it out quickly, where the paint came from).
Pressure Rollers
Pressure rollers and pressure roller attachments are the next best thing in terms of production, and should be used where overspray cannot be controlled or will be to time consuming to protect from (in terms of masking off). See Pressure Rollers
Small cup gun sprayers, which are much easier to clean up, will have a (much) lower minimum threshold before using. In general, the electric cup
Spraying different colors
If you have 35 gallons of paint to apply BUT, there are 4 different colors which require flushing out the sprayer and repriming with the new color, then you probably would be better off rolling the paint. Color changes are time consuming with sprayers, they are better suited for large quantities of paint - all the same color.
Spray painting is faster than rolling and brushing. You don’t have to cut in, or dip into a pan or bucket as you would with a roller. Paint coverage and hiding is better with a sprayer too. But, even with it’s advantages, spraying isn’t always the way to save time and increase production. Some of the factors you will need to consider before you decide to spray are listed below.
Should You Spray? - or Roll?
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