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Antique Tractor Paint and Bodywork

Industrial hardner

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john in la

04-11-2005 07:28:47




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Ready to do another paint job and I have a few questions before I start.

I know if I use a auto paint I have to watch the temperature for the reducer I buy and also the hardener is only good for a short time after opening. (longer if put in fridge)

The question I have is about the industrial hardener. I know it can be used in any temp but feel it will also go bad over a short time.
It is only available in one size at my supplier. Qt because that is how much you need for the gal of paint. and paint only comes in gallons.

It will take me a while to use the whole gallon but do not want to have to buy 4 hardeners just to spray 1 gallon of paint.

Any Ideas.

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CNKS

04-11-2005 17:36:07




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 Re: Industrial hardner in reply to john in la, 04-11-2005 07:28:47  
A rule of thumb that is not etched in stone is that the unopened hardener has a shelf life of 2 years, opened it needs to be used in 2 weeks -- this is not absolute. Various kinds of gas can be squirted into the can just before closing that will make it last longer. One comes in pressurized cans and is called Bloxygen -- Rod(NH) may have more to add about the other gases. The gas and the refigerator should make it last several months -- but I have never used any longer than about a month, preferring to at least get new hardener when I get new paint.

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Unruh

04-12-2005 06:25:33




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 Re: Industrial hardner in reply to CNKS, 04-11-2005 17:36:07  
How do you know or can tell that hardner has gone bad? What is the result of using old hardner? When I read this post I thought of my "sticky" problem below. I flamed the project with the acytelene torch, but didn't blister the paint and repainted it. It seems to be okay. That was fresh hardner that I used.



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CNKS

04-12-2005 17:02:33




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 Re: Industrial hardner in reply to Unruh, 04-12-2005 06:25:33  
The 1st tractor I painted, I did not know the hardener had an opened shelf life, although it said so right on the can. The last items I painted were the lights, I don't believe the paint cured properly, this was maybe 3-4 weeks after opening. It was dry but lacked gloss, it was not sticky, but seemed to be affected by fingerprints, etc. -- that is the only experience I have had, and since I always squirt gas in mine now, I will probably not find out anything else.

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Unruh

04-12-2005 06:23:03




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 Re: Industrial hardner in reply to CNKS, 04-11-2005 17:36:07  
How do you know or can tell that hardner has gone bad? What is the result of using old hardner? When I read this post I thought of my "sticky" problem below. I flamed the project with the acytelene torch, but didn't blister the paint and repainted it. It seems to be okay. That was fresh hardner that I used.



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dufrain

04-11-2005 15:52:20




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 Re: Industrial hardner in reply to john in la, 04-11-2005 07:28:47  
I buy regular car paint enamel,hardner for my industrial tractor store paint, by the pint.I mostly dont use it all at once.I have one thats half full from last summer im getting ready to use.Once you mix the hardner in the paint is when you have a time limit.Thin your paint with regular enamel reducer instead of naphtha like it says on the can and it will dry quicker and go on glossier.



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dufrain

04-11-2005 15:50:50




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 Re: Industrial hardner in reply to john in la, 04-11-2005 07:28:47  
I buy regular car paint enamel,hardner for my industrial tractor store paint, by the pint.I mostly dont use it all at once.I have one thats half full from last summer im getting ready to use.Once you mix the hardner in the paint is when you have a time limit.Thin your paint with regular enamel reducer instead of naphtha like it says on the can and it will dry quicker and go on glossier.



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