Painting detached garage

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Old 10-28-15, 07:06 PM
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Painting detached garage

Hi - So I'm looking to paint the exterior of my detached garage. The sides are each roughly 21' x 8' so with the windows & doors I calculated roughly 620 sq ft. I had two questions:

(1) The coverage calculator says I need just shy of 4 gallons of paint. Can that be right?
(2) What's my best method of application? It's not that big so I was going to just brush it on, but will it look better if I rent a sprayer?

As always, any advice is appreciated!

Thanks,
Andy
 
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Old 10-28-15, 07:21 PM
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Is the 4 gal figure for two coats? Sounds way high if it's for one coat, maybe a little high if for two, depending on the paint. Label usually gives coverage estimates.

I think you're better off brushing. For one thing, I think it helps the paint adhere better when you brush it in good. Second, by the time you fuss around renting the sprayer, masking everything off, and cleaning the sprayer, you won't save much time.
 
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Old 10-28-15, 07:55 PM
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Brush or roller would be my choice. Paint typically covers a few hundred square feet so two coats might be ok but definitely seems high for one coat.
 
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Old 10-28-15, 08:31 PM
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What type siding?
Has it been pressure washed yet?
A 9" roller and a 2-1/2" sash brush for touch ups is what I would use.
Good luck trying to just use a paint brush.
 
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Old 10-29-15, 04:08 AM
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What paint calculator did you use

Most paints get 400 sq ft per gallon on a slick substrate, rougher siding will require more paint. Depending on the type of siding there may be more sq footage to be coated than what a simple calculation shows. A better description of the siding or some pics would allow us to better advise you on how much paint is needed.

Whenever spraying paint unto siding it is best to back roll or back brush the coating to work it into the substrate - that will result in a longer lasting paint job. Spraying isn't always quicker once you figure in the extra prep needed along with clean up time. You also must be mindful of where the overspray will go! While I've done a lot of spraying on new construction, I very seldom spray any repaints.
 
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Old 10-29-15, 04:44 AM
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Thanks for all the advice, guys. It's aluminum siding, and it's pretty rough. I'm on my phone so it's not letting me post a photo. I think I will buy just 3 gallons, and I'll go with a roller (and brush for the touch up). I'll let you know how it goes!
 
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Old 10-29-15, 04:52 AM
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Oxidation [chalk] is a big problem with older aluminum siding. Run your fingers across the siding and see if any chalk is deposited on your fingers. I'd wash the siding with TSP [add bleach if there is mildew] and rinse well. If all the chalk doesn't wash off add EmulsaBond to the 1st coat of paint.

I normally spray aluminum siding because it's easier to get good coverage and it looks a little nicer. It can be easy to get into trouble spraying so unless you have a good bit of spraying experience it's usually better to brush or roll the paint. Those little mini rollers work well on siding.
 
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Old 10-29-15, 10:50 AM
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Thanks marksr

I power washed & the surface seems ok. Definitely not going to use the sprayer!
 
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