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Hardner Question

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n8terry

06-02-2007 16:48:38




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In the past couple of years I have accumulated hardners from different paint suppliers. All of these hardners are for the various kinds of enamel paints that I purchased at the time.

Question-- Is there a way that I can determine if these various hardners will work with certain enamels? Do they work with all enamels?

thanks for your help




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circus

06-03-2007 15:26:41




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 Re: Hardner Question in reply to n8terry, 06-02-2007 16:48:38  
Some universal hardener manufacturers have cross reference tables. For example Start with Dupont cross to Marhide cross back to PPG etc.



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Frank Stalfire

06-03-2007 09:35:46




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 Re: Hardner Question in reply to n8terry, 06-02-2007 16:48:38  
you got some great advise from these guys and the only thing i would add is that the active ingredient is isocyanate and the difference in the activators is the concentration of iso's and the solvent blend. The solvent is not really relavent, some activators will have little iso's and alot of solvent causing a mix ratio like 2:1 and some are rich with iso's and low solvent causing a mix ratio of say 4:1 so it is not possible to determine what ratio you should use unless your good at chemistry, they will work with enamel but at what ratio?

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CNKS

06-02-2007 19:02:38




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 Re: Hardner Question in reply to n8terry, 06-02-2007 16:48:38  
Hardeners have a shelf life of maybe 2 years unopened, less than a month open. I'm not saying they are not still good after that time, since the manufacturers may do that to reduce their own liability. If you want to use a 5 year old hardener it is possible that it may be ok, but you are on your own. You can lengthen the life by putting an inert gas in them after opening and keeping them refrigerated. I use a product called Bloxygen and have a $75 "refrigerator" from Home Depot I use for that purpose. It is not a good idea to mix different brands, but a lot of people do. To me it is not worth the risk. As a general rule, buy what you need for the paint you intend to use, then use it.

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B-maniac

06-02-2007 19:15:51




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 Re: Hardner Question in reply to CNKS, 06-02-2007 19:02:38  
Unfortunately , you are living proof that so called "bargains" are usually not. If you would use one "system" and supplier you wouldn't have to dump all that aged and unused hardner. That sounds expensive to me. Each major manufacturer has a system matched to your conditions and style. You should read all the tech sheets and talk to the factory reps. (not the auto store geek)and find what fits you best and then use it and learn and adapt the system until you perfect it. It's better to be a "painter" than an experimenter any day!

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rustyj14

06-02-2007 17:03:41




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 Re: Hardner Question in reply to n8terry, 06-02-2007 16:48:38  
When i worked in Auto Body work, we used the hardener that matched the paint (manufacturer's name brand.) I'd suggest going to a paint store or supplier of auto body paints, and pick their brains! Or, mix up an ounce or so of color, add a bit of hardener, and paint a sample. That way you'll know if it is compatible. If it won't mix, and dry satisfactorily, you won't have wasted a lot of work and time! Rusty

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