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Old 12-13-2010, 08:04 AM   #1
katit
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Default Painting when cold outside

I had question about painting inside. Garage is pretty much finished - I need to paint some trim/windows. Windows and trimwork need to be primed (oil primer) and then painted. It's around 0 degree here in STL.

I can warm up garage to 70 degree no problem but I'm not sure if it's good idea to paint since it's cold outside.

They say it's going to be around 35 degrees on Thursday. Is it OK to paint then?
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Old 12-13-2010, 08:14 AM   #2
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Default Re: Painting when cold outside

I wouldn't. The paint should have specific instructions on the side of the can regarding at what temperature to paint for best results. Most of what I use say the ambient temperature (surrounding) should be AT LEAST 60 degrees F. Otherwise you will have to paint it again.

You might get the "room" up to 70 but the window trim is likely going to be much less.

Might as well do it right, heh?

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Old 12-13-2010, 08:16 AM   #3
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Default Re: Painting when cold outside

Yeah, I have the same issue. My garage holds, even in this single digit temps, a good 45 degrees... I was going to add some heat to the garage to paint it but I think I'll have to wait until spring time...
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Old 12-13-2010, 08:35 AM   #4
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Default Re: Painting when cold outside

There is some cold temp paints that work better in cold weather. I can't remeber the specifics of the paint but most good paint stores (MAB, Sherwin Williams) could advise on the stuff I am talking about. But in general if you see painters working on exterior paint in the cold they have it set up with plastic sheeting and some heat so the paint will adhere.
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Old 12-13-2010, 08:38 AM   #5
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Default Re: Painting when cold outside

Primer I'm using:
http://www.paintdocs.com/webmsds/web...odno=650133408

Says that temps have to be 35+

So, if it's going to be 35 on Thursday and I warm up inside to 70+ it should be fine I guess?

Paint is the same, Sherwin-Williams recommends 35+ for temperature..

P.S. I'm painting inside. I think temperature of surface will be between outside and inside.
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Old 12-13-2010, 09:05 AM   #6
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Default Re: Painting when cold outside

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Originally Posted by katit View Post
Primer I'm using:
http://www.paintdocs.com/webmsds/web...odno=650133408

Says that temps have to be 35+

So, if it's going to be 35 on Thursday and I warm up inside to 70+ it should be fine I guess?

Paint is the same, Sherwin-Williams recommends 35+ for temperature..

P.S. I'm painting inside. I think temperature of surface will be between outside and inside.
That Sherwin-Williams is some good stuff!

You might also consider the "residual" temperature after a warming period. In other words, the window trim might hold the colder temperature for a period of time after warming. I recently bought an infrared thermometer just for similar situations. I really hate to do things twice.

I just took some readings in my kitchen using the infrared thermometer, around the trim and am getting a low of around 40 F. ("Your mileage may vary")

Steve
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Old 12-13-2010, 10:09 PM   #7
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Default Re: Painting when cold outside

Just paint it
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Old 12-13-2010, 10:17 PM   #8
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Default Re: Painting when cold outside

I can't say about paint, but I used a poly-urethane clear finish in my garage on the workbench in about 35 degree conditions. That did not go well at all. I had to sand it off.
It won't be 70 degrees in my garage until baseball season.

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Old 12-13-2010, 10:28 PM   #9
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Default Re: Painting when cold outside

The trim you need to paint is inside, right?

I had success in painting inside my garage last winter by putting a high-powered work light close to what I was painting.

I painted a free standing coat rack and wall mounted coat rack with oil based paint. The light kept them at a constant, reasonably warm temperature.

However, I imagine this is a huge fire hazard.
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Old 12-14-2010, 01:54 AM   #10
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Default Re: Painting when cold outside

I just painted some steel in my garage, and it was 50 degrees near the ceiling, with water drops on the floor freezing quickly. I only had the heat on for a few hours, just to paint, then over night. Outside it was -10 to -20F. I kept the air up high at 50 all night, but was sleepy-headed and left the metal on the floor. Uninsulated concrete floor. It dried in a couple of days, with intermittent warming; 2-part epoxy. The aluminum tray I mixed in sat outside for several days at -10 to -20F. It eventually dried and hardened. My neighbor has painted trailers at -30F with oil paints; they dry, and stay on. I painted a steel tank w/ a poly floor paint, over a primer, at about 15-20F, and never turned the heat on. It dried just fine. I think oil paint is pretty robust, FWIW....
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Old 12-14-2010, 05:08 AM   #11
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Default Re: Painting when cold outside

If your garage is insulated and you can heat it the same as you can your house, I would bring it up to temp for at least 24 hours. I've painted our inside trim around the windows in the house in the winter with no problem what-so-ever. Just make sure it is up to temp for a prolonged period before starting.
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Old 12-14-2010, 05:20 AM   #12
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Default Re: Painting when cold outside

I just painted some trim pieces with SW oil primer in my basment. It's about 60* and 25% humidity. 48 hours and it's still not dry (hardened), even though it was thinned a lot. Painting outside this summer with the same paint and 90* with 75% humidity, it dried and hardened in about 2 hours. Tells me that the heat is more important than humidity.
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Old 12-14-2010, 08:37 AM   #13
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Default Re: Painting when cold outside

Don't forget proper ventilation, some paint can be deadly in enclosed spaces.

I would wait till it was warmer, but I have to come up with other excuses for not painting here.
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Old 12-14-2010, 08:40 AM   #14
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Default Re: Painting when cold outside

Quote:
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Don't forget proper ventilation, some paint can be deadly in enclosed spaces.
Explosive too, depending on the heat source.

Solvent based paint in an environment with an open flame heater....
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Old 12-14-2010, 09:06 AM   #15
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Default Re: Painting when cold outside

I have split-air heat pump in garage. I can leave it on for a day before painting and then switch to oil-filled space heaters during painting.

Prime is oil-based, paint is not.
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Old 12-14-2010, 01:07 PM   #16
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Default Re: Painting when cold outside

So last week, I'm in the basement painting some new storm windows I had made. Oil based paint, with a crapload of thinner so they'd dry. Since there were so many, I had them spread out in all 3 rooms. I'm painting one, and bang my head on something - my furnace that is suspended from the ceiling (basement is about 10 ft. deep). Now, it's cold here, and my GAS furnace is running.

My first thought was 'Well, if it blows, I'll go quick'.

I normally don't paint in that room or the one with the water heater in it, but I was trying to get a lot of them done at one time.
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Old 12-14-2010, 03:21 PM   #17
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Default Re: Painting when cold outside

I've got some staining to do, my garage is insulated, but not heated. I've been leery to put the stain on, all I have is a propane torpedo 30k-50k btu that I really don't want to run. I'm wondering if, as it warms up during the day, will it dry some, them dry some more the next day?
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Old 12-14-2010, 03:29 PM   #18
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Default Re: Painting when cold outside

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Originally Posted by 1320stang View Post
I've got some staining to do, my garage is insulated, but not heated. I've been leery to put the stain on, all I have is a propane torpedo 30k-50k btu that I really don't want to run. I'm wondering if, as it warms up during the day, will it dry some, them dry some more the next day?
If it freezes before it fully dries, it may not turn out so well.
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