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Old 06-18-2017, 05:07 PM
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Induction Time

Exactly what is it?

I see SPI epoxy requires induction time after thorough mixing (must mean that it needs to set before using) and requires remixing before dispensing (using) .

Am I wrong here?

What does induction time have to do with anything. Is it because of something different in the paint?And if so, is it better ?



Keep in mind I can paint the town but .........

I am asking because I am at the stage where I am starting Body and paint on the 64 and I need to know.
I am pretty much trying to figure out what to use, what I can use, what I should use..........

DB,martin Sr , Shine , ....anybody.....HELLLLP

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Old 06-18-2017, 05:11 PM
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Induction time is the period where the molcules of the paint cross link with the molecules of the catalyst thus making the paint one.

Most epoxies require a minimum of 1/2 hour but many let it sit overnight for high end restoration work.

John
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Old 06-18-2017, 05:15 PM
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I see. The chemical reaction after you mix it. OK got it.

I see some paint says no induction time necessary. Is that a sign of a lesser quality primer (epoxy) ?
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Old 06-18-2017, 06:02 PM
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Quote:
Originally Posted by LATECH View Post
I see. The chemical reaction after you mix it. OK got it.

I see some paint says no induction time necessary. Is that a sign of a lesser quality primer (epoxy) ?
I am no chemist but many of the finest 2k paints have used had no induction time so I would think not. All of the epoxies I have used had an induction time though.

John
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Old 06-18-2017, 06:48 PM
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I believe epoxy primer is the only automotive product which might call for an induction period, and that it's because it's the only product type based on epoxy resin. Epoxy primer is available which uses either a catalyst requiring induction time or another that does not. Potlife is the difference, as far as use of the product. One will last all day in the gun, the other will not. That's my take on it. To my knowledge it is not an indicator of quality.
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Old 06-18-2017, 07:02 PM
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Cool. So a product with no induction time will have a shorter potlife time?

Or am I just overthinking here?
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Old 06-18-2017, 07:24 PM
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I think that's it, not the overthinking part. I believe it stems from when bodymen kept a gun full of lacquer primer in their box, to cover bare metal throughout the day. When epoxy came along, they wanted a product that would at least last through a shift and were OK waiting that first half hour. That's my crackpot theory. To avoid a flurry of web speculation, consult the technical data sheet available at the manufacturer's website of the products you are considering. The best answer to your question is usually there, because products vary so much and formulas change.
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Old 06-18-2017, 07:42 PM
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All Good info.Thank you both for the help.

More questions to come....LOL
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Old 07-06-2017, 11:29 AM
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Quote:
Originally Posted by idrivejunk View Post
I believe epoxy primer is the only automotive product which might call for an induction period, and that it's because it's the only product type based on epoxy resin. Epoxy primer is available which uses either a catalyst requiring induction time or another that does not. Potlife is the difference, as far as use of the product. One will last all day in the gun, the other will not. That's my take on it. To my knowledge it is not an indicator of quality.

The hardener for the Valspar tractor and implement enamel I'm using currently calls for a 30 minute induction time.




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Old 07-06-2017, 04:29 PM
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Wasn't Barry K the SPI dictionary, he's not around ?

Greg
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Old 07-07-2017, 05:19 AM
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I don't know why but you should go to the SPI web site to ask this one.
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