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Old 11-14-2014, 08:46 PM   #1
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Default Painting with PPG Pitthane

Has anyone sprayed deck and joist with PPG Pitthane when the temperature is in the 20s? If so was there any failure? I am in a bit of a pickle with this cold weather snap we are having and am wondering if I should pull the trigger.
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Old 11-14-2014, 10:30 PM   #2
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This is for the Menards garden center (exterior overhang). Has any of you Menards guys pushed the limit on the pitthane as far as temps?
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Old 11-15-2014, 01:29 AM   #3
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Correct me if I am wrong but doesn't Pitthane emit cyanide fumes strong enough to kill you deader than dead when sprayed? If my memory serves me correctly I am pretty sure you need to have a positive pressure air mask on when spraying this product. I would highly recommend that you read the tds and/or talk to your PPG product rep before pulling the trigger.
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Old 11-15-2014, 10:15 AM   #4
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Quote:
Originally Posted by minnesota View Post
Has anyone sprayed deck and joist with PPG Pitthane when the temperature is in the 20s? If so was there any failure? I am in a bit of a pickle with this cold weather snap we are having and am wondering if I should pull the trigger.
It doesn't look like you should pull the trigger. Particularly since this is a thermoset coating that can have the conversion process retarded by a drop in recommended temps.

From the Pittthane Ultra TDS

Apply only when air temperature is 40F (4C) or higher and when
surface temperature is at least 5F (3C) above the dew point.
The
solvents contained in these products can lift some alkyd, oil based and
other coatings that are not resistant to strong solvents. A test patch
application is recommended. Not recommended for dimensionally
unstable substrates, such as large expanses of wood, or for immersion
service. Do not apply to concrete surfaces below grade or in other
applications where hydrostatic pressure is present. Not intended for
residential use. Color begins to change at 275F (135C). Drying times
listed may vary depending on temperature, humidity and air movement.
Spray equipment must be handled with due care and in accordance with
manufacturer's recommendat!on. High-pressure injection of coatings into
the skin by airless equipment may cause serious injury.
1 hour
Accelerated Potlife:
30 minutes
Accelerated Handle:
Accelerated Recoat: 30 minutes
Dry Time @77F (25C); 50% relative hum!dity
Pot Life: 3 hours
In Service Temperature:
Dry Heat (F): 350 Dry Heat (C): 177
Flash Point: 95-812 84F, (28.9C)
95-819 331F, (164C)

Last edited by CApainter; 11-15-2014 at 10:18 AM..
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Old 11-15-2014, 10:26 AM   #5
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Quote:
Originally Posted by Lambrecht View Post
Correct me if I am wrong but doesn't Pitthane emit cyanide fumes strong enough to kill you deader than dead when sprayed? If my memory serves me correctly I am pretty sure you need to have a positive pressure air mask on when spraying this product. I would highly recommend that you read the tds and/or talk to your PPG product rep before pulling the trigger.
As long as there is good vent!lation, and you are wearing, at minimum, an APR (Air Purifying Respirator) you should not exceed exposure limits. Where a lot of painters get the most exposure to isocyanates, is during the mixing process. The catalyst contains the isocyanates, and many times the seemingly benign process of mixing a two component paint will lull painters into mixing without a respirator.
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Old 11-15-2014, 11:49 AM   #6
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Quote:
Originally Posted by CApainter View Post
It doesn't look like you should pull the trigger. Particularly since this is a thermoset coating that can have the conversion process retarded by a drop in recommended temps.

From the Pittthane Ultra TDS

Apply only when air temperature is 40F (4C) or higher and when
surface temperature is at least 5F (3C) above the dew point.
The
solvents contained in these products can lift some alkyd, oil based and
other coatings that are not resistant to strong solvents. A test patch
application is recommended. Not recommended for dimensionally
unstable substrates, such as large expanses of wood, or for immersion
service. Do not apply to concrete surfaces below grade or in other
applications where hydrostatic pressure is present. Not intended for
residential use. Color begins to change at 275F (135C). Drying times
listed may vary depending on temperature, humidity and air movement.
Spray equipment must be handled with due care and in accordance with
manufacturer's recommendat!on. High-pressure injection of coatings into
the skin by airless equipment may cause serious injury.
1 hour
Accelerated Potlife:
30 minutes
Accelerated Handle:
Accelerated Recoat: 30 minutes
Dry Time @77F (25C); 50% relative hum!dity
Pot Life: 3 hours
In Service Temperature:
Dry Heat (F): 350 Dry Heat (C): 177
Flash Point: 95-812 84F, (28.9C)
95-819 331F, (164C)
Unless he's using Pitthane high build, 95-8800

From the TDS:

Permissible temperatures during application:
Material: Ambient: Substrate:
40 to 90oF 20 to 100oF 20 to 140oF
4.4 to 32oC -7 to 38oC -7 to 60oC
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Old 11-15-2014, 09:17 PM   #7
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I'd say you would be ok down to the mid 30s, but I definitely wouldn't push it into the 20s. Not likely with a urethane like this, but it might be worth a quick call to ppg and see if they have an unlisted low-temp part b. Also note that the substrate and ambient temps might have a 40 degree minimum, but the material itself is 60 minimum.
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Old 11-15-2014, 09:23 PM   #8
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also assuming you are using 95-812 and not the hi build stuff...
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Old 11-21-2014, 01:00 PM   #9
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Doing it in the 20s is a little low. It is something that is generally not suggested by ppg representatives, but you should either read instructions carefully or call up a ppg expert, only then you would be in a better position to take the right decision.
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Old 11-21-2014, 08:30 PM   #10
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Thanks for the responses.. I got the GC to pump heat in for us.
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Old 11-21-2014, 09:53 PM   #11
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Quote:
Originally Posted by minnesota View Post
Thanks for the responses.. I got the GC to pump heat in for us.
There ya go!
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Old 12-02-2014, 12:25 PM   #12
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PPG Pitthane paint is best when used in temperature a little higher than 25 degree celsius. Pulling the trigger will result in striping on the parts.
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Old 01-19-2015, 03:37 PM   #13
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Quote:
Originally Posted by minnesota View Post
Thanks for the responses.. I got the GC to pump heat in for us.
I wish all GC's would do that.

20's too low
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