Shutting the fans off after universal clear

O

Outlaw

This one is driving me nuts. When you shoot universal clear, what is the purpose of shutting the fans off after one minute? Im sure there is a logical explanation, but I can not come close to why this is part of the process. I have every intention of doing it, just need to understand why I'm doing it.
 
Thanks shine, I can cross that one off my list now. Shut off the fans after one minute....and now I know why.
 
Hey now theres a good question. It would make sense to let the solvent escape? No?
 
Outlaw;39435 said:
Hey now theres a good question. It would make sense to let the solvent escape? No?
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If you dry the last coat to fast you'll trap solvents in the under coats and
that promotes pin holes.
 
We have to redo the cowl panel on the camaro since I wrecked the rally stripe, I am gonna try turning off the fan to slow the flash to see if there is a smoother coat that is allowed to dry together after the second coat. Just wondered if anyone had tried it yet.
 
All the SPI clears are made this way, so the opposite of all other companies, the reason is when this company was started it was made for restorations shops only and those shops don't paint everyday and therefore don't have the high end bake booths the production shops have.
 
the air flow helps draw out solvents. between coats it helps to flash off. for the last coat you want it to stay open as long as possible so tail solvents can escape without effecting the surface.
 
So bottom line, you shut the fans off after one minute and leave it off until you start the next coat....and continue with your coats doing that same process including last coat. Correct?
 
anotheridiot;39452 said:
We have to redo the cowl panel on the camaro since I wrecked the rally stripe, I am gonna try turning off the fan to slow the flash to see if there is a smoother coat that is allowed to dry together after the second coat. Just wondered if anyone had tried it yet.
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Hope you get back to us and let us know how it worked between coats.

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Got it Shine, directions apply only to last coat. Reading thru the threads I got a little confused what the bottom line was. Thanks!
 
Outlaw;39461 said:
Hope you get back to us and let us know how it worked between coats.

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Got it Shine, directions apply only to last coat. Reading thru the threads I got a little confused what the bottom line was. Thanks!
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I just tend to over think things, I think of flash as a shell, hard outside, soft inside. I am moving from a product called ultra flo clear, there was almost no peel at all that needed to be cut after paint. Maybe the first coat needs to go on thinner to get all the solvents out within the 30 minutes instead of thinking shutting off the fans will allow the solvents to all get out together..

Again, I am more industrial / military. we use polyurethanes at 6:1 mix that dry in a few hours. others are 2:1 that take days. I was surprised how fast 1:1 universal cures actually. but some catalysts are made where the more you use the faster it dries, others are opposite.
 
I have the same problem, over think everything and get myself in trouble.
 
I shut the fan off between all my coats Universal is all I clear with and by doing this it has all but eliminated any kind of solvent pop issues and I'm usually putting down 4 or more coats for all that color sanding and buffing we hate so much!!
 
Air flow in my booth is a little weird in comparison to what most of you are spraying in and I find that it's best to wait until the clear is tacking up before shutting down the fan..

My air comes in from the side, and one side will be drying while the other side still dripping wet, You really have to be on you're toes when painting in there.
I imagine some of you also have sub par booths so letting it run a few more minutes may be beneficial as well.

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Outlaw;39506 said:
I have the same problem, over think everything and get myself in trouble.
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Yes,, sometimes you just have to wing it, and hope for the best.. None of us know the outcome when we go into the booth, no matter how much you paint.. Things happen.
 
coupe;39662 said:
I shut the fan off between all my coats Universal is all I clear with and by doing this it has all but eliminated any kind of solvent pop issues and I'm usually putting down 4 or more coats for all that color sanding and buffing we hate so much!!
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Thanks for answering. We were told to increase air pressure and are trying a slower activator this time. I just am worried about alot of pressure because I know that helps kick up alot of dirt and dust.
 
i turn on my fan and blow out everything good. then wait at least 30 min. the fan stays on until my last coat. when the fog clears i shut it down .
 
shine;39684 said:
i turn on my fan and blow out everything good. then wait at least 30 min. the fan stays on until my last coat. when the fog clears i shut it down .
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I agree with Shine. A natural curing of the materal is far better IMO then forcing it dry. Some places (sometimes my work place included) use curing lamps and IMO you just can't push the chemical drying/cure time, only the solvent drying which can cause problems. But working in a production shop the Ins. Co.'s don't care so there are more times then not you just have too push the envelope.
 
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