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Antique Tractor Paint and Bodywork

Urethane cure time

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pat sublett

10-24-2013 06:35:41

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I know there are variations depending on brand and quality but, basically how long does it take urethane enamel to reach its maximum hardness. The specific brand that I am using is Martin Senour (Napa) Crossfire.

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10-28-2013 21:14:51

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 Re: Urethane cure time in reply to pat sublett, 10-24-2013 06:35:41  
As far as I know, it's "acrylic urethane". I've never heard enamel put with it. I don't believe urethane enamel is a correct term.

Definitely overnight. If you can wait 5 or 6 weeks before wet sanding and buffing, you'll get the best results. Not always possible, but works for show cars. Also, don't wash it for 6 weeks, carwash or by hand.
This post was edited by Brad_bb at 21:15:48 10/28/13.

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dr sportster

10-25-2013 14:55:38

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 Re: Urethane cure time in reply to pat sublett, 10-24-2013 06:35:41  
Like flatbed said always read the tech sheets .Write down notes on a file card to keep in your pocket while working. Everything you want to know from dry time between coats to total cure time is in those sheets which are posted on line.The spec you want is the cure time.

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10-25-2013 14:05:14

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 Re: Urethane cure time in reply to pat sublett, 10-24-2013 06:35:41  
I saw your earlier post and checked the 55a. It is document # MA4644. If you click on the blue highlighted number in the listing, it will bring up the PDS for your paint.
Air dry at 70* is 80 min. tape free in 12 hours, colorsand and buff after 24 hours.

I recently retired from NAPA, and as a courtesy, we printed the PDS for every paint order, for every customer. Ask your paint guy for a copy.

If you have any questions, I'm happy to help if I can.


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10-25-2013 13:32:58

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 Re: Urethane cure time in reply to pat sublett, 10-24-2013 06:35:41  
Quoting Removed, click Modern View to see

Pat, go to www.martinsenour-autopaint.coM
Click on cross fire in paint systems. The product data sheets will give you all the info you are looking for. You will need to know your product number which will be on the label your NAPA store put on the can.


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David G

10-25-2013 10:18:05

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 Re: Urethane cure time in reply to pat sublett, 10-24-2013 06:35:41  
glennster probably has the cure time right, I have never looked at it, but I usually consider the paint to be dust free in about an hour.

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10-25-2013 07:24:47

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 Re: Urethane cure time in reply to pat sublett, 10-24-2013 06:35:41  
crossfire is generally an overnight dry time, at 70 degrees or better. forced air (spray booth) can be baked and dry in 4 hours. maximum hardness is in about 7 days.

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pat sublett

10-25-2013 11:36:12

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 Re: Urethane cure time in reply to glennster, 10-25-2013 07:24:47  
Thanks very much

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