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Tool Talk Discussion Forum

How to prep old barn for painting?

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Daniel (PA)

03-31-2008 08:14:00




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Our old bank barn is partially raw weathered wood and partially painted (previous owners never fully painted it). I want to stain it red this spring. How should I prep the wood? Is pressure washing best? How much pressure? There are a few hundred hay bales in the mow. Will these get too wet and create a fire hazard. Any input will help. Thanks, Daniel




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oldhousehugger25

04-03-2008 17:25:08




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
I don't see anyone addressing the moldy hay issue. Yes it will mold your hay and it could make for some hot spots.
Stain could go on right over what you've got without waterblasting, but you will have to redo it in about 5 years anyway.



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Bendee

04-01-2008 05:52:27




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
I would undercoat it with oil based paint because all the oil would have dried out over the years.Then finish with oil paint.In effect you are replacing the oils.
Plastic paint would only put a skin over it and do nothing for the wood.Look good for a while.
To each his own.



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flying belgian

03-31-2008 19:01:50




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
cover it with tin and be done with it forever.



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RobMD

03-31-2008 16:37:01




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
Pressure washing will saturate the wood with excess water, causing the stain to bleach out and enamels to chip off. That is, if it's been pressure washed a month or so ago, then you could paint it then, but not the day after pressure washing.

I always like to paint with acrylic oil/latex mix stain. That stain entrenches itself in the wood and provides a semi-layered coating as well.



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Ron Anderson

03-31-2008 17:33:39




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 Re: How to prep old barn for painting? in reply to RobMD, 03-31-2008 16:37:01  
I usually wait three days after pressure washing and in 12 years never had a failure.



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ebolch

03-31-2008 11:04:48




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
Ditto on watching out for too much pressure vs not enough water, use a wide fan tip, start about 12" away from the wood and slowly move in until you are lifting the old paint without cutting the wood fibers. Let it dry for at least 3 or 4 days in hot sun. when you get ready to paint, carry a scraper in your back pocket to remove any parts of the paint that may have lifted after the wetting/drying process (it always hapens). Best primer I ever made (oil base- 3 parts primer, one part linseed oil, one part wood preservative. It is a little thinner than regular primer so use a finer tip in the spray gun Let it soak in for a couple of days. If you use oil based paint you are good to go. If you use latex over the oil primer, it has a tendency to trap moisture and it will grow dark mold on the outside. But the paint will stick like glue. 12 yrs on my house, would have lasted longer but the wife got tired of the color.

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Don L C

03-31-2008 10:58:57




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
Old weatherd barn wood is used today inside new houses,picture frames and other things....you might look into it .....the old wood will sell for double new....



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Ron Anderson

03-31-2008 09:07:50




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
I have been painting old barns and houses for 12 years and I use a pressure washer with 7 gallons a minute and 2200 psi. Works good and the secret is the volume of water. You can ruin the wood if you're not careful. Thats why a smaller volume of water will harm the wood more then the larger volume of water. It usually takes 300 gallons of water to do a typical barn.



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steve in in

03-31-2008 08:58:46




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 Re: How to prep old barn for painting? in reply to Daniel (PA), 03-31-2008 08:14:00  
I can't answer about the hay bales. I do think you have the idea though. What I found when pressure washing mine was, if I got too close, it would cut into the fibers of the wood. So I just kept watch on how close I got with the wand.

After drying for a few days, I put primer on and sprayed the best paint I could find. 9 years later it doesn't look much different than the day I painted it. It has held up really well.

The large sprayer that you just put into a 5 gallon bucket was well worth the money.

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