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Antique Tractor Paint and Bodywork

Cool weather hardeners

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lonestarjeff

12-22-2004 00:14:13




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I did a little painting this past weekend. I used an acrylic paint(Tisco)w/ hardener. I thinned the paint w/ VM&P naptha & added the recommended ratio of hardener. The temperatures ranged from upper 30"s to upper 60"s(low humidity)for 2-3 days after spraying the parts. Temp was around 65 when I sprayed(approx. 2pm).

As I am a novice when it comes to this type of painting, maybe my expectations were a little high, but I expected the catalyzed paint to be dry to the touch within a couple of hours @ that temperature. It was not "dry" to the touch until the next day mid-morning.

Does this sound to you guys like the paint did in fact catalyze? How sensitive is this stuff to temp?

Jeff

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flathead

12-22-2004 06:24:13




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 Re: Cool weather hardeners in reply to lonestarjeff, 12-22-2004 00:14:13  
I've been using PPG omni Acrylic Enamel with hardner on an 8n over the past several months. If I remember correctly, the P-sheet for this paint/hardner says to maintain a temp of at least 60 degrees and the paint will not catalyze (cross link) below 55 degrees. I think the total stated drying time is 16-hours to "polish and put into service at 70 degrees".

Flathead



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lonestarjeff

12-22-2004 18:09:19




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 Re: Cool weather hardeners in reply to flathead, 12-22-2004 06:24:13  
With the weather pattern I descibed in the original post(high 30"s-high 60"s), does the cooler night "postpone" catalyzation "til it warms up again the next day? Or is there a window of time(to catalyze)right after you spray?

Sorry if I"m being dense. I want to understand how this works.

Jeff



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CNKS

12-22-2004 18:24:13




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 Re: Cool weather hardeners in reply to lonestarjeff, 12-22-2004 18:09:19  
Again, I won't say that your paint is not catalyzed, but the recommendation is, I believe, to keep the temperature above 55 degrees after spraying. I prefer to have it in the mid-sixties or above, but I have no proof of that. I don't think you can delay the cross linking, I was not particularly good at chemistry, particularly the organic kind. Perhaps Rod(NH) will respond -- he usually has an explanation, including links. 30 something or 40 something is too cold. Frank Stalfire is a DuPont rep, he is welcome also.

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Frank Stalfire

12-22-2004 19:23:21




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 Re: Cool weather hardeners in reply to CNKS, 12-22-2004 18:24:13  
Cool temps will slow everything down for sure. NOt only the cureing but also the solvents don't evaporate like they need to, the iso's stop curing around 55, and will start again when temps rise but even as they work at 55 they work slowly, every major paint companies has support products to help with cold weather applications, mostly in the form of accelerators, low temp hardeners and reducers are just normal ones with an accelerator on it. Also be sure it was mixed correctly, extra hardener from over catalization and extra resin from under catalization will keeo the paint wet.

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CNKS

12-22-2004 07:51:13




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 Re: Cool weather hardeners in reply to flathead, 12-22-2004 06:24:13  
This is the link -- I don't see the 55 degree thing, but I always try to maintain over 60 degrees anyway.



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flathead

12-22-2004 08:25:09




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 Re: Cool weather hardeners in reply to CNKS, 12-22-2004 07:51:13  
Thought I had seen the minimum temps on the p-sheet. It may have been off autobodystore.com. Below is a link for an article which says in general 2k paints won"t cure below 55 degrees. Like you said, I maintain a shop temp of at least 60 degrees for at least a day or two after shooting.



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