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Old 10-31-2011, 02:09 PM   #1
DansYellow66
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Default Painting in wet weather?

I'm planning to take some time off next week and paint my Cobra replica project with single stage urethane (PPG). Weather forecast looks like it will be warm enough - highs in the 70s - but there is some wet weather in the extended forecast for the three days I figure it's going to take me to paint this thing. (day 1 - doors, small items and underside of hood/trunk), day 2 - flip hood and trunk over and paint, day 3 - paint body)

I remember that higher humidity was something to avoid when I painted lacquer many years ago. Is this something I need to worry about with urethane? I will be painting in a visqueen enclosure set up inside a warehouse with fan ventilation.

Thanks
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Old 10-31-2011, 08:30 PM   #2
CF6873
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I also remember the lacquer days when the paint would blush white.

The humidity should not affect the urethane other than maybe slightly

slow the flash time.

Good Luck,

Craig
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Old 11-01-2011, 08:08 AM   #3
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That's what I was hoping to hear.

Thanks
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Old 11-01-2011, 08:34 AM   #4
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excessive moisture can effect urethane. clear can actually blush just as lacquer did. worse is iso clumping which will look like dirt in the paint . if humidity is high do not wet the floors. make sure your air supply is dry.
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Old 11-01-2011, 01:23 PM   #5
DansYellow66
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Quote:
Originally Posted by porchdog View Post
excessive moisture can effect urethane. clear can actually blush just as lacquer did. worse is iso clumping which will look like dirt in the paint . if humidity is high do not wet the floors. make sure your air supply is dry.
I think I'm still OK. This is single stage. I plan to cover the floor with building paper taped down and my buddy with the warehouse has a large air compressor with an industrial drier. But, I also plan to install a trap and regulator at the entrance to my booth and also use one of those orange moisture traps at the gun.

Thanks
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Old 11-01-2011, 01:58 PM   #6
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dry air will help. i would loose the ball filter. they restrict flow and hvlp's need plenty. i have to run 100+ at the wall with my iwata.
a hot humid day is worse than a rainy day. good luck with it.
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Old 11-01-2011, 09:29 PM   #7
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OK - will do. One thing less to be dangling from the spray gun.
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Old 11-02-2011, 04:38 AM   #8
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I've never had any problems with humidity, in MD. we get a good bit. When spraying in less than ideal booths/barns,garages rain is a good thing, it keeps the dirt down.
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Old 11-02-2011, 07:10 AM   #9
porchdog
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tech classes in the early 70's stressed this because of the old habits of wetting floors in booths. hot day with 80% humidity and a wet floor would all but guaranty iso clumping. those of us in the south have had to deal with this since urethanes came out .
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Old 11-03-2011, 04:41 AM   #10
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That's interesting, I've been to a dozen or so tech classes in the 80's-90's and it was never mentioned. Alot of places with crappy booths wet the floor down around here.
A couple months ago I did a 3 stage on a Neon SRT at night in a shop where rain comes down the left booth stack. It started raining during sealer, by the time I got to clear there was a couple inches on the booth floor. The only problem I had was splashing water up on the rockers dragging the hose around.
I'm gonna ask a couple reps about this, when it's hot and 95% humidity, your using a solvent that wasn't anhydrous to begin with thats been opened a couple times there must be % of water to begin with.
A couple times a year we get weeks where it rains on and off, high humidity and no sun. I sure can't wait to see how productive we can be with waterbourne base next year, you can put all the fans in the world in that booth and it won't do squat if the air's already full....
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Old 11-03-2011, 03:29 PM   #11
JBL Specialty
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My shop is in virginia and I use glasurit 90 waterborne and have never had any problem with it drying too slow. My booth only has its factory fan and it dries in about 15 min.
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Old 11-04-2011, 01:10 PM   #12
Keith Carlson
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John,

I've always been a fan of the German paint manufacturers and was wondering if you have used have used any of the SPI clears (specifically their Universal Clear) with the Glasurit 90 line. I may have read one of your posts over on the C1,C2 threads that you preferred the Glasurit clear. Is that right?

Thanks,

Keith
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Old 11-04-2011, 03:54 PM   #13
JBL Specialty
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Hi Keith, yes I have used spi universal clear over 90 line with on problem,but your right I usually use glasurit 923-109 clear. The only problem with the Glasurit clear is the cost. A gallon of clear and hardner cost $600.00
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Old 11-04-2011, 08:25 PM   #14
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Quote:
Originally Posted by JBL Specialty View Post
The only problem with the Glasurit clear is the cost. A gallon of clear and hardner cost $600.00
Wow, is that pricey!

Thank you for for the reply!
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Old 11-04-2011, 08:35 PM   #15
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Gallon of Spies fp2002blueblack 386.00 Gal. Of 8035 hs clear 210.00
h
Hardner and reducer extra
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Old 11-18-2011, 03:58 PM   #16
Scott Marzahl
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Does anybody know how the Glasurit 923-255 HS clear sprays or how it compares to the 923-109?
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Old 11-18-2011, 03:58 PM
 
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