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Old 05-09-2006, 11:28 PM
X711
 
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Reduce Paint prior to adding hardner or not

Guys this might seem like a odd question, but in pondering some info
tonight I figured some of you may be able to chime in with your
taught's.

On a typical spec sheet for urethane based paint it may require a ratio
of 3 parts paint to 1 parts hardener/Activator. Now to my questions.

1 Do you reduce the paint prior to adding the hardener or not.
2 Do you add the hardener to the paint and then reduce the mix as needed.

I typically add the hardener then add the reducer, mix well and let sit prior
to painting. But in thinking about this it struck me that the actual paint ratio
to hardner ratio is less but equal because they are both reduced. Would the
hardner in this case be less effective ? from the chemistry standpoint or does
it not matter.

Your insight on this much appreciated.

Thanks ><

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Old 05-10-2006, 06:09 AM
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It does not matter when you reduce the paint, just get the proportions accurate. The ratio would not change, for instance, PPG DCU2002 clear is mixed at a 4-1-1 ratio. Pour out 4 parts clear, 1 part reducer, and 1 part activator. It does not matter if you are mixing up several ounces or an entire gallon. The ratio is not figured after the activator or reducer is added. The ratio is the parts unmixed.

Easiest thing to do is just buy some mixing cups that have the proportions on them. At my PPG jobber the quart size is only 25 cents.

Vince

Last edited by 302/Z28; 05-10-2006 at 06:17 AM.
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