urethane reducers all the same? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-22-2010, 07:28 AM
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urethane reducers all the same?

I know that there are typically three grades, slow, medium and fast. But are the brands pretty much all the same. Could I use Summit brand reducers in SPI epoxy etc?
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Old 02-22-2010, 08:10 AM
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why would you want to ???
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Old 02-22-2010, 08:17 AM
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The SPI epoxy is giving me a lot of orange peel which is fine for now. I am just sealing the metal. I intend on sealing the body work when I am done with their epoxy and they recommend reducing it 10 to 50% for sealing. The question was more general than that though. I see a lot of places where they instruct you to use reducers. However, some are more expensive than others.
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Old 02-22-2010, 08:25 AM
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well, they may be compatible, but warranties and reccomendations say otherwise..

it might work but it might not.. you could PM Barryk and ask him for help as to why it's orange peeling
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Old 02-22-2010, 10:46 AM
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There's a big difference in some reducers.
There are some that are a lot "hotter" than others.
I don't mean temperature, they're more hot, like will disolve what
you spray them over easier . Some brands are known for this.
Most are foreign made with US labels.
Also, some of the cheaper ones have a higher moisture content.
I use some cheaper ones for priming but for base and clear
it pays to use a good one. SPI is one of the best.
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Old 02-23-2010, 05:32 AM
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Reducers have a water content,The cheaper ones genealy have more water.I've used Nason reducer(cheap stuff) with SPI epoxY and all other urathane primers at one time or an other ... it just thins the primer and evaporates, there's so little difference,its not much to worry about...paint on the other hand is a different story ...I always try to use the recommended reducer but when you run out????read the ingredients first ...never mind about aromatic fragrances...I think they're there just to make it smell different than all the others.....but I could be wrong... Having five kinds of reducer on the bench and running out of one brand sucks. if you dont need a whole gallon you CAN get by using something else.
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Old 02-23-2010, 06:57 AM
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wow. water in the reducer? water in car paint just sounds bad in general. after filtering the water out of the air to the gun it just makes no sesne to add it to the paint.
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Old 02-23-2010, 12:28 PM
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If you talk to your paint store they often carry brands of reducer that are less expensive. Since they are not part of a companies paint system, they are engineered to work in multiple brands of paint. I use GROW brand, mixing it with R-M, PPG, HOK, X-Otic, and Marhyde products with no trouble.

One of the things I like about these types of reducers is that they are not as aggressive as some of the "brand names", which penetrate and often lift and wrinkle underlying paint.

With most of these generic reducers, you will have to use the next slower grade, or mix a slightly higher percentage with the color.
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Old 02-23-2010, 03:39 PM
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yuper,thats what I like about them too, they arnt so agressive.I was sure surprised when I found about the water content though its a small % measured in parts per million its not like 25% or anything but water just the same.....A guy that makes it told me this.also told me what reducers work best to substitute for SPIs when I ran out and only had a little epoxy to reduce because i didnt want to buy a whole gallon of it and have it sitting around for months not being used.
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Old 02-23-2010, 11:48 PM
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Most all reducers Ive used have all worked the same PPG Dupont BASF I have also went out of the system and used other brands of reducer and have never had any problems and here is a page that shows the ingredients in reducer http://www.keystone-auto.com/bodysho...msds-key81.pdf
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Old 02-24-2010, 04:46 AM
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Interesting.....In "materials to avoid" it lists peroxide....The main ingrediant in bondo hardners......and chromates ...an ingrediant in some primers....
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Old 02-24-2010, 05:13 PM
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I know it sounds better to just go out and buy a cheapo $20 a gallon reducer because its $20...but c'mon. Just grab some spi reducer. It's of the high quality at over half of the price. My sikkens reducer is about $95 a GALLON. SPI's is between $30-$50. ALL of your premium paint lines' reducers are generically the same. I wouldn't consider summit a "premium" paint. If i've crossed paint mfgs i've always used the highest grade of reducer i could...i.e using sikkens reducer in hok.
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