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Old 08-20-2013, 07:16 PM   #1
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Painting James Hardie Siding and Trim


I could really use some advice on a project.

I am about to finish installing all new siding on a small house/cabin. The siding is 4x8 James Hardie Vertical panels (Fiber Cement). It is about 5 sheets wide at the gable end and about 7 sheets long (20 feet by 28 feet) and it is about 11 feet to the peak of the gable.

The owner wants me to paint the panels one color and the trim another. All the material comes factory primed and is a pale yellowish color. The owner likes the color of the primer and wants the finish paint to be the same color.

Does anyone have any advice for me as far as painting this goes? Specifically some things I'd like to know are:

Should I paint the trim before I install it or after?
Do I need 1 coat of paint or 2 since it is the same color as the primer?
Should I use an airless sprayer or rollers and brushes?

Plus any other tips you might have.

Thanks

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Old 08-20-2013, 10:58 PM   #2
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Painting James Hardie Siding and Trim


Make sure edges cut or factory are primed.2 coats on everything for sure.I would brush and roll myself nothing against spraying but if you're not experienced don't do it.I would probably paint the trim and then second coat it after installed.What paint are you using?

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Old 08-21-2013, 09:48 AM   #3
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Painting James Hardie Siding and Trim


I also like painting the trim with 1 coat before install, and another after. It's easier to completely cover the trim before installation, and often necessary to at least touch up if not give a complete coat after. Make sure to paint the edges of the siding, with special attention to all cut edges, since they will not have primer on them. Again, the first coat can be applied before installation if you like, with a roller then backbrushed. Airless sprayer is super fast if you can control the overspray.
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Old 08-21-2013, 12:48 PM   #4
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Painting James Hardie Siding and Trim


For a primer, an exterior acrylic with good pH resistance (Hardie is cementitious), and two topcoats of an 100% acrylic paint would be fine.
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Old 08-21-2013, 02:20 PM   #5
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Painting James Hardie Siding and Trim


The preprimed HardiPlank should not require a separate primer (the OP said it was factory primed with that pale yellow color).
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Old 08-21-2013, 04:21 PM   #6
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Painting James Hardie Siding and Trim


Thanks for the info.

So is there a debate as to whether I need to prime it first vs whether the factory primer is good enough. I'd like to only have to coat it twice if that can be done acceptable. Either 1 coat of primer and 1 coat of paint, or just two coats of paint. What do ya'll think?
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Old 08-21-2013, 04:25 PM   #7
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Painting James Hardie Siding and Trim


IMO it would be a waste of time putting another coat of primer on it. Installers everywhere are putting paint right over the preprimed boards, and I've never heard of any issue with it.
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Old 08-21-2013, 04:36 PM   #8
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Painting James Hardie Siding and Trim


From what I remember, the manufacturer specs that Hardee should be painted within 180 days of instillation. Factory primers are pretty puny to begin with, and will degrade fairly quickly when exposed to the weather.

I have done it doth ways (primed and not primed) and have never had a failure. But the ones I primed with Loxon masonry primer have resisted fading better than the others.

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