Got a new paint sprayer but unable to avoid overspray?
If you’re not familiar, overspray is the term used when more paint is used than is required to cover a specific surface.
With the advent of paint sprayers, overspray is more common than you think, so you’ll want to be sure how to identify it and solve it when it occurs while painting your home.
In this guide, we’ll cover overspray basics, including what causes the phenomenon and how you can prevent it when painting.
Keep reading to find out what you can do to solve this common problem and get that superior paint job that will leave people marveling.
What is Paint Overspray?
Paint overspray is typically a form of minute particles that spreads on the topcoat or any other surface.
It is generally formed as a rough to touch texture on an unintended object or location which is not easy to wash off.
What does it look like?
Overspray can be of different sizes and amounts. In most cases, it will look like fine dust over the painted surface that feels hard and rough.
However, if the paint droplet you get on the surface is bigger, the overspray will most likely look like a hardened raindrop.
Consider for example, the paint, varnish or stain particles drifted onto the window trip when you intended to paint the walls in your room.
Or if it gets on the windshield when you are spray painting your car body.
What Causes Overspray When Spray Painting?
In this section, we’ll cover the most common causes of overspray when painting. As you’ll find out, the causes are relatively simple and easy to fix. They are:
Don’t underestimate the power of the wind in affecting your paint job. If it’s too windy outside, you may find that your paint is being moved in the undesired direction.
This can make it harder to get the job done cleanly and efficiently, as you will inevitably waste more paint as you try to cover the target area.
Depending on the pressure and direction of the wind, you may find that you have more overspray at times than others.
The solution is simple: Don’t paint outside if the wind is blowing too badly.
If you’re painting indoors, turn off any fans so that you don’t have any unintended pressures acting on the paint coming from your spray gun.
2- Spray Pattern:
If you find yourself with too much overspray, it may be because you have the wrong spray pattern.
Depending on the size of your surface, you’ll want to make sure that your spray pattern matches the job at hand.
For example, spraying a narrow surface with a broad spray pattern will inevitably lead to overspray, as you are emitting more paint than is necessary.
This will lead to a lumpy paint job and extreme loss of paint as a large volume of paint misses the target area or is piled on top of an area that has already been painting.
The good news is that most spray guns are adjustable, with both narrow and broad spray patterns available.
This means that you’ll be able to fix the spray pattern of your device simply by fiddling with the nozzle of your spray gun.
3- Air Pressure:
If you find your window or door paint job suffering from overspray, the cause could be as simple as too much air pressure.
Simply put, too much air moving through the machine can cause the paint to release from your spray gun too quickly. The result is a high-impact splatter that will ultimately create a lumpy finished look.
Of course, depending on the job at hand, you may need a high-pressure machine to do your work (especially if you have to cover a large area).
Still, overspray could be a sign that your pressure is too high. In these cases, always remember that you can lower the pressure on your device for a smoother, more even application.
4- Distance from Target:
How close you stand to your target could also be the difference between a quality paint job and one ruined by overspray.
One of the biggest mistakes beginners make is using their paint sprayers too close to the target surface. Doing so can lead to incredible amounts of overspray and an overall unattractive finish.
Along with the clunky overspray pattern, you’ll also find that spraying too close leads to the dreaded “drip-down” that occurs when too much paint is applied.
On a related note, you’ll want to be sure that you’re not standing too far away, which will cause your paint to splatter and won’t adequately cover the target area.
For best results, you’ll want to be sure to stand between 7 to 10 inches from the surface you are painting – because this is typically a distance which an overspray can travel to in most cases.
7 Different Ways to Prevent Overspray when Painting
With this information in mind, it’s time to look at some different ways to prevent overspray when painting. Simply put, it’s not enough to know what causes overspray.
In order to have an effective paint job, one must also know what steps to take to correct the problems at hand.
This will ensure that you get a clean and even finish on your target surface.
1- Create A DIY Spray Booth
Let’s start with the basics. Getting your spraying area enclosed is one of the best ways by which you can easily avoid the overspray.
A DIY spray booth or a portable paint shelter (made up of plastic sheet) can help you out in building your own cabin where you can spray easily without worrying about spilling the paint all over your place.
By working within this spray booth, you can dramatically reduce the chances of getting the paint sprinkles on your other items/surfaces in a room you are painting in.
Just bring the items inside this enclosure and spray your stuff.
If you do not have enough budget (for buying a spray booth) you can consider building a DIY shelter using some old cardboards to form a big box.
The only downside to using these booths is you can only use them for spraying smaller stuff (such as cabinets, chairs, tables, etc) and not the interior or exterior walls.
2- Use Adhesive Tape or Cloth
The smallest, as well as the cheapest you can use, is an adhesive tape or an old (but clean) cloth to cover your stuff.
If it’s a smaller area, trims or edges, you fear to overspray, you can make use of tape. Or else wrapping the area with a piece of cloth (or a roll of plastic) can do a job.
Make sure that you do not use old newspapers to cover the area you do not want to get paint on. Paint when sprayed can sweep through these and can still damage your surfaces making it mess.
3- Use the Right Type of Sprayer
This leads us to our next point. If you want to prevent overspray, make sure that you are using the right type of sprayer.
Remember that traditional spray guns give you the highest likelihood of overspray, particularly if you are working on a small surface.
For this reason, you may choose to go with an airless paint sprayer or even a high volume low pressure (HVLP) sprayer, which uses low pressure and a fine mist of paint to make sure that you get the job done quickly and without overspray.
Obviously, the type of sprayer you choose will depend on the work you are doing. If you are painting the outside of a house, for instance, you’ll probably want to go with a higher-powered option.
If you’re simply painting furniture, however, an HVLP spray gun may serve your purposes better.
4- Use the Correct Amount of Pressure
One of the easiest ways to correct overspray is to make sure that you are using the correct amount of air pressure.
If you find that your paint job is lumpy or drippy or that you are simply using too much paint, it may mean that you should adjust the air pressure.
For best results, make sure to start with the lowest pressure possible and work your way up if you need to. This will ensure that you’re not just blasting full force right out of the gate.
You may also choose to go with an airless paint sprayer. Because these sprayers rely on pressure other than air to get the job done, they result in less overspray and instead coat the target surface with a fine mist.
If you are working with smaller projects, especially, you may find these types of spray guns more effective at preventing over-splashing.
5- Select the Correct Nozzle Size
You’ll also want to pay attention to nozzle size. The rule to remember is the bigger the nozzle size, the more paint you will be releasing.
For this reason, correcting your overspray could be as simple as getting a smaller nozzle for your paint gun.
Keeping this in mind, make sure that you have a variety of nozzle sizes on hand so that you can get through your project cleanly and without unnecessary overspray.
This is particularly important if you are working on a project that requires broad application in some parts and finer applications in others.
6- Increase Electrostatic Charge
Generally employed by professionals in spraying/painting, Electrostatic painting is a process in which the magnetic field is used to apply the paint on metals and a few other types of plastic items.
If you want to spray like a professional (without any overspray) you can learn the process to know how you can increase the electrostatic charge on paint particles.
The basic principle behind this is to let the mist of sprayed paint get attracted to the target surface.
In addition to avoiding the overspray, the electrostatic charge on paint particles also does help in adhering the paint to the surface better. Hence creating a much smoother paint coating.
Electrostatic spray painting is also a good way to spray a three-dimensional object more evenly as the paint gets bonded better without any wastage, enabling you to get a much better finish.
7- Practice and Learn The Spray Techniques
“Practicing makes the man perfect”
It’s true in every field including the home paint job.
Over-splashing of the paint over other pieces of stuff is generally the problem for beginners.
If you are trying hand over spraying for the first time (just because you are passionate about DIY tasks), it’s important that you learn a few techniques and expert strategies on how to spray correctly.
Websites like YouTube are loaded with such techniques that come directly from the experts in the field.
It is good to invest some time into it before you actually start spraying.
What Is the Best Way to Fix Over Sprays?
If at times you happen to get overspray, even after trying to avoid them, there are ways by which you can get rid of them.
Depending on the type of paint, the painted surface, and the size of overspray you can use agents like acetone, wd-40, rubbing alcohol, paint thinner, etc.
Also, you can try polishing or buffing the surface to polish out overspray.
If you want to get overspray off glass window, plastic, car windshield, or any other smooth surface, you can also use a retractable safety scraper or a razor blade to remove the thick layer of overspray.
Just scrape the paint off carefully and vacuum the paint shavings. If you want, here are few other diy paint removers I have mentioned. Maybe you will find them useful.
The Bottom Line
Overspray is a common problem when spraying your walls, ceilings, or even your car.
In general, the easiest ways to correct overspray are by adjusting air pressure, using the right sprayer, and selecting the right nozzle.
This is because air pressure and spray pattern are two of the most common causes of excess spraying. Be sure to watch out for the wind, too, if you are painting outside.
These tips are a nearly foolproof way to protect your target surface from overspray. Keeping this in mind, you’ll be able to get that superior paint job you’ve been looking for!
Jack Luis is a semi-retired painter who loved painting his clients’ ideas on their walls. He had worked as a painter for more than a decade to serve the customers in areas such as Charleston, Mount Pleasant, Beaufort, Georgetown, SC (South Carolina). Today in his free time, he likes to read and write about the newer techniques that are being implemented in his profession. You may read more about him here or get in touch with him here.