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Old 04-27-2016, 10:02 PM
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Spi Epoxy Primer - Temperature Critical?

I've been priming my '66 Mustang. I am ready to put a coat of spi Epoxy Primer on as my final coat but the tech sheet says that the temperature should be at least 65deg F and the metal temp should be the same and be held at that temp for 24hrs after painting. I built a paint booth outside of my garage and don't have a way to heat it. The temperature has been in the mid 60's during the day but gets down to low 50's to high 40's at night. How critical is it to keep the car at 65deg or above for 24 hours or even while painting? If i apply the epoxy when its 55deg out will i be ok? I'm guessing there is some leeway here but not sure how much. Any suggestions? Or comments are greatly appreciated.

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Old 04-27-2016, 11:18 PM
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Molecular crosslinking stops below 55 degrees. That means hardeners don't work and stuff doesn't cure. One of the SPI advocates here may have product-specific experiences to speak from. I do not.
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Old 04-28-2016, 06:51 AM
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Follow SPI's tech sheet. You'll have nothing but problems if it doesn't cure properly.
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Old 04-28-2016, 07:01 AM
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call SPI that's what the tec line is for. I know its hard to get used to but you can call them any time with any questions you have.
I have had problems on a few occasions but it sounds like your using it as a sealer so heres a little trick you can try or ask about.
Mix the epoxy the day before let it sit over night, reduce it 10 -20% or more (it drys faster when reduced)
prime it in the morning or as soon as its warm enough.
I have reduced this epoxy 30 and 40% over bare metal and painted an hour later. I've also had to wait 2 weeks for it to cure as a primer sprayed at 60 degrees then getting below 50 at night .
I tried letting it sit over night (somewhere warm) and couldn't believe how fast it cured the next day when I sprayed it.
This stuff is pretty versatile once you get used to it.
Before trying anything call them.
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Old 04-28-2016, 12:02 PM
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Quote:
Originally Posted by deadbodyman View Post
I have had problems on a few occasions but it sounds like your using it as a sealer so heres a little trick you can try or ask about.
I am looking to use it as a sealer and had planned on reducing it 20%
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Old 04-28-2016, 05:35 PM
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Just talked to spi's hotline and they told me that if 50deg out and sunny roll the car out in the sun for and 1hr then roll it in the booth and paint the epoxy. Then wait a half our roll it back out into the sun let it sit for an hour or so then roll it back into the booth and paint my basecoat.
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Old 04-28-2016, 11:59 PM
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Metal temp has a lot to do with it. Makes sense.
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Old 04-29-2016, 06:54 AM
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So what did you think of that tec line they have?
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Old 04-29-2016, 11:11 AM
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It was very informative. He was able to tell me how to do it by the book and then how to use short cuts and get around different stuff. I will be using them again that is for sure.
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