Rolling Vs. Spraying

 
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Old 01-18-2011, 11:04 AM   #1
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Rolling Vs. Spraying


I hear that when spraying paint on walls you go through much more paint than if you were to roll the paint on. What do you think the the ratio is between Rolling vs. Spraying? You think you use twice as much paint spraying compared to rolling?
Also if this is true why does spraying use more paint? Is it because waste in the sprayer lines or does it make the paint coat heavier?
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Old 01-18-2011, 11:20 AM   #2
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Re: Rolling Vs. Spraying


I don't think spraying uses more paint though the person doing the spraying may use more paint.

We only spray new work so it needs priming and two coats. A re-paint of the same color probably only needs one coat. One coat rolling will use less than three coats spraying but that's a function of new/repaint, not the process.

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Old 01-18-2011, 07:12 PM   #3
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Re: Rolling Vs. Spraying


The main problem is paint that is sprayed and ends up somewhere other than the intended surface. IIRC, the transfer effeciency of airless sprayers is in the 60-70 percent range, i.e. about 1/3 of the paint ends up elsewhere. Operator error can also have a huge impact on this. Poor spray techique can result in much more overspray and well as much higher film thicknesses. Airless sprayers can put out a tremendous amount of paint: at full bore, our main unit puts out just over a gallon/minute.

In the hands of a skilled operator, transfer effeciency are maximized, film build is appropriate, and the additional cost of the material is more than offset by the speed of the operation.
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Old 01-19-2011, 11:30 AM   #4
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Re: Rolling Vs. Spraying


The biggest problem is people using blown tip or well used ones. and two much pressure.
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Old 01-19-2011, 12:07 PM   #5
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Re: Rolling Vs. Spraying


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The main problem is paint that is sprayed and ends up somewhere other than the intended surface. IIRC, the transfer effeciency of airless sprayers is in the 60-70 percent range, i.e. about 1/3 of the paint ends up elsewhere. Operator error can also have a huge impact on this. Poor spray techique can result in much more overspray and well as much higher film thicknesses. Airless sprayers can put out a tremendous amount of paint: at full bore, our main unit puts out just over a gallon/minute.

In the hands of a skilled operator, transfer effeciency are maximized, film build is appropriate, and the additional cost of the material is more than offset by the speed of the operation.
Well said
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Old 01-19-2011, 02:03 PM   #6
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Re: Rolling Vs. Spraying


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The biggest problem is people using blown tip or well used ones. and two much pressure.
David
Exactly, we've see guys use 2-3 times the amount of paint because of this.

OTOH, some guys around here try to "stretch" the paint and get the maximum coverage to minimize material costs. The combination of insufficient paint and tardy backrolling makes for some pretty nasty-looking paint jobs.
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Old 01-19-2011, 06:07 PM   #7
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Re: Rolling Vs. Spraying


Good advice Gough. I have a question to add. Say you have a stucco home that's 1100 sqft, with a zero lot line so the homes are really close together, would you spray or roll? I am think I am just going to roll that sucker out with a fatty roller


Sorry for adding a question
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Old 01-19-2011, 06:16 PM   #8
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Re: Rolling Vs. Spraying


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Good advice Gough. I have a question to add. Say you have a stucco home that's 1100 sqft, with a zero lot line so the homes are really close together, would you spray or roll? I am think I am just going to roll that sucker out with a fatty roller


Sorry for adding a question
It depends, does the neighbor want his house to be the same color?

I would certainly roll it. As windy as it is around here, I don't want to spray exteriors unless they: don't have much mature landscaping; don't have really close neighbors; and don't require much masking. In other words, we don't spray many exteriors around here. Often, the first questions our prospective clients ask us is whether or not we'll be spraying.
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Old 01-19-2011, 07:16 PM   #9
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Re: Rolling Vs. Spraying


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It depends, does the neighbor want his house to be the same color?

I would certainly roll it. As windy as it is around here, I don't want to spray exteriors unless they: don't have much mature landscaping; don't have really close neighbors; and don't require much masking. In other words, we don't spray many exteriors around here. Often, the first questions our prospective clients ask us is whether or not we'll be spraying.
Thanks for the advice, rolling it might be cleaner with less clean up. Here in Northern California it's not that windy and most painters spray exteriors but the weather can be unpredictable as well as this house is in a planned community and it's really close to the other houses and I am talking close, I don't want the neighbors to be pissed at me because I hope I get more jobs
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Old 01-21-2011, 06:24 AM   #10
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Re: Rolling Vs. Spraying


We prefer to spray whenever we can. With painters weho know what they are doing a great deal of labor cost can be saved. all though the project has to be big enough to warrant the sprayer set up/clean up and the time of masking
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Old 01-21-2011, 10:41 AM   #11
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Re: Rolling Vs. Spraying


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Originally Posted by rise-craftsmen View Post
Thanks for the advice, rolling it might be cleaner with less clean up. Here in Northern California it's not that windy and most painters spray exteriors but the weather can be unpredictable as well as this house is in a planned community and it's really close to the other houses and I am talking close, I don't want the neighbors to be pissed at me because I hope I get more jobs
I would turn pressure down as far as I could and still retain a decent pattern, and spray closer. I do a ton of work on the beaches and the wind is always blowing and overspray is an issue.

Just pay attention to where its going. I have a man on the ground moving the ladder, and sprayer for the spray guy and he also keeps an eye on that as well.
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Old 01-21-2011, 10:48 AM   #12
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Re: Rolling Vs. Spraying


Consider using an 18" roller if rollering. The job will go much faster and you will get a good workout if you need it!
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Old 01-21-2011, 10:54 AM   #13
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Re: Rolling Vs. Spraying


Thanks for the info. We're going to have to watch the paint crew more closely.
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Old 01-21-2011, 11:32 PM   #14
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Re: Rolling Vs. Spraying


Thanks for the advice lower pressure should work, but maybe I need a workout so I might go with the 18" roller..
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Old 01-22-2011, 03:14 PM   #15
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Re: Rolling Vs. Spraying


New tip, 100 foot hose and watch the overspray. It is amazing what a worn tip will do to the material consumption on a large spray project
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Old 01-22-2011, 07:08 PM   #16
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Re: Rolling Vs. Spraying


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Originally Posted by JLawver1 View Post
I hear that when spraying paint on walls you go through much more paint than if you were to roll the paint on. What do you think the the ratio is between Rolling vs. Spraying? You think you use twice as much paint spraying compared to rolling?
Also if this is true why does spraying use more paint? Is it because waste in the sprayer lines or does it make the paint coat heavier?
Who told you that ? the guy at Homedepot ?

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