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Old 07-15-2008, 03:46 PM
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urethane activator ratio question

Will using less activator/ harderner in urethanes slow down the kick times as if you were using a slower reducer
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Old 07-15-2008, 04:28 PM
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Quote:
Originally Posted by jimmy1
Will using less activator/ harderner in urethanes slow down the kick times as if you were using a slower reducer
----------------------------------------------------------

Sure will and stop it from curing totally.
Don't even consider it.

With clears most companies set the ISO to Polyol ratio 1.10/1.0 or 1.05/1.0
NCO/OH depending on the polyol used in the clear in other words when you mix the activator say 4:1 with that ratio the company may have it figured out that you are over activating maybe 5% or so as it is very difficult to get all the iso's and polyols mixed to mate in a shop condition.
A lot of this also depends on type of ISO used or mixed together as some are more reactive then others as well as the type of polyol used or net of two or three blended together.

This is really nothing for you to fool with, follow instructions as you can get away with doing this but you will always pay for it long term in clear durability and chemical resistance.
Change speeds of reducers all you want but let the company decide the ISO mix ratio as it is one of the most critical and hardest things a company does is figuring the ratio for each clear so it will work for you the best it can.
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Old 07-16-2008, 07:15 PM
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urethane activator ratio question!

Thanks Barry! I'am shooting nason 497 clear with the slowest reducer and getting mixed results with the flow out. My question was a stab in the dark, and I know better. I think I might need cooler days its been over 95 in the shop lately.
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Old 07-16-2008, 07:30 PM
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Other ways to slow down clear when out of options as far as speed of reducers.

Lower air pressure. (5 lbs can make a big difference)
Go to a 1.4 tip VS a 1.3 (if applies)
Cut back on amount of reducer.
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Old 07-17-2008, 07:04 AM
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The 497 can be a little fast on hot days even with the high temp cat. Which I'm guessing your refering to rather than reducer as 497 is not normally reduced. You can reduce it 10% or so for flow coating and doing so with their slowest reducer may help as well.
498 or 465 "may" be a better option for you. Ask your jobber about them.
The 465 is their "better" clear of the line and the 498 I don't personally know much about.
Like Barry said,You may have to open the gun up and go a little slower.
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Old 07-17-2008, 07:48 AM
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I had a hard time getting the Nasson clear to flow too.
One thing that can help a lot, use retarder in place of some
of your reducer. With retarder, you can slow it down more
without over-reducing it and asking for runs.
It makes a big difference.
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Old 07-17-2008, 10:38 PM
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Urethane ratio question !

Wow!!! Who were those masked men? Although my 1.4 tip is on a piece of junk gun and the 465 and retarder were like moon rocks to find in this area, I see what you all mean! " Big improvement " You have to understand that I'am still working with a lacquer mind in a urethane world and the more I hear " It shoots just like lacquer" the more I realize "No it doesn't". In lacquer land elbow grease is the great equalizer and in urethane world fluid control is. Thanks
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Old 07-18-2008, 05:01 AM
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Glad to hear it.
I'm an OLD lacquer man myself.

(I agree it's nothing like urethane.)
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Old 07-18-2008, 05:47 PM
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The 465 IS sweet ain't it BUT,
Try some SPI Universial clear and you'll never touch Nason again.
Then,Step up to their MS clear. Out'a site man.
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Old 07-18-2008, 08:09 PM
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urethane activator question!

If his clear is anything like his epoxy, I'll dito that!
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