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Author Topic: Dupli-Color Reducer  (Read 4318 times)

Offline Steve Helmick

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Dupli-Color Reducer
« on: December 04, 2015, 05:58:10 PM »
So, I was over at my street-rodder/modeler friend's shop. He is rebuilding a '65 (early style) Plymouth Barracuda (slant 6) and getting it ready to repaint (himself). He's got a second one that's orange, that's getting a 340 V-8 and 4 speed from is parts bins.

Here's the question: He had a PPG can of the lacquer and two cans of Dupli-Color reducer. Both thinner cans said "medium-fast" and also said "100% Acetone". This made me wonder how they make slow/medium/fast drying reducer if they're 100% Acetone. Wouldn't there be some percentage of retarder? And also, I thought lacquer thinner was definitely not 100% Acetone. Please excuse me if this has already been discussed...or just cussed.

He said the cans were about $25, and that he probably got them at Black Diamond Auto Parts...maybe. What they actually had in them was leftover turquoise lacquer from the last time he painted that 'Cudda.    D>K Steve
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In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline billbyles

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Re: Dupli-Color Reducer
« Reply #1 on: December 07, 2015, 02:42:54 PM »
Quote from: Steve Helmick on December 04, 2015, 05:58:10 PM
So, I was over at my street-rodder/modeler friend's shop. He is rebuilding a '65 (early style) Plymouth Barracuda (slant 6) and getting it ready to repaint (himself). He's got a second one that's orange, that's getting a 340 V-8 and 4 speed from is parts bins.

Here's the question: He had a PPG can of the lacquer and two cans of Dupli-Color reducer. Both thinner cans said "medium-fast" and also said "100% Acetone". This made me wonder how they make slow/medium/fast drying reducer if they're 100% Acetone. Wouldn't there be some percentage of retarder? And also, I thought lacquer thinner was definitely not 100% Acetone. Please excuse me if this has already been discussed...or just cussed.

He said the cans were about $25, and that he probably got them at Black Diamond Auto Parts...maybe. What they actually had in them was leftover turquoise lacquer from the last time he painted that 'Cudda.    D>K Steve

Hi Steve,

If the Dupli-Color is really thinned with 100% acetone then it is definitely fast reducer.  Acetone is the fastest solvent used to dissolve and thin lacquer and there is nothing faster used in that application.  Lacquer thinner is a combination of about six or more solvents/thinners.  Some of the solvents are used to dissolve the basic lacquer resin, and some of the solvents are used to thin that dissolved mixture and to control drying speed (& thus the flow-out of the finish.)

You might get away with using 100% acetone painting a very small part in low temperature but painting a car using that thinner would be a recipe for a very dry finish with low intercoat adhesion.
« Last Edit: December 08, 2015, 12:18:11 PM by billbyles »
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Offline Mark Scarborough

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Re: Dupli-Color Reducer
« Reply #2 on: December 07, 2015, 02:46:58 PM »
Quote from: billbyles on December 07, 2015, 02:42:54 PM
Hi Steve,

If the Dupli-Color is really thinned with 100% acetone then is definitely fast reducer.  Acetone is the fastest solvent used to dissolve and thin lacquer and there is nothing faster used in that application.  Lacquer thinner is a combination of about six or more solvents/thinners.  Some of the solvents are used to dissolve the basic lacquer resin, and some of the solvents are used to thin that dissolved mixture and to control drying speed (& thus the flow-out of the finish.)

You might get away with using 100% acetone painting a very small part in low temperature but painting a car using that thinner would be a recipe for a very dry finish with low intercoat adhesion.
thank heavens ,, another voice of reason,,

good answer Bill,,
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Offline Steve Helmick

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Re: Dupli-Color Reducer
« Reply #3 on: December 07, 2015, 05:35:16 PM »
Quote from: billbyles on December 07, 2015, 02:42:54 PM
Hi Steve,

If the Dupli-Color is really thinned with 100% acetone then is definitely fast reducer.  Acetone is the fastest solvent used to dissolve and thin lacquer and there is nothing faster used in that application.  Lacquer thinner is a combination of about six or more solvents/thinners.  Some of the solvents are used to dissolve the basic lacquer resin, and some of the solvents are used to thin that dissolved mixture and to control drying speed (& thus the flow-out of the finish.)

You might get away with using 100% acetone painting a very small part in low temperature but painting a car using that thinner would be a recipe for a very dry finish with low intercoat adhesion.

Yeah, that's what I thought! I've bought and used "lacquer thinner" from the hardware store and found it worked fine in clear dope, both Nitrate and Butyrate...as long as I didn't mind it blushing. Which I did, OBTW. Funny thing is that I don't recall ever having trouble with blushing in the '50's or '60's. I'm not real sure what brands I used (that didn't blush), but know it wasn't Aero Gloss...that stuff always gave horrid sore throats, so I learned to avoid it early on. Testors was ok, but I think I may have bought some clear butyrate from an aircraft supply place. No recall of thinner, but maybe the same source. When did SIG come out with dope? I never saw any until the '60's, at least. But then, we always lived on a remote AFB or someplace like Pullman, WA. In fact, it was Pullman, WA!  LL~ Steve
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"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline Mark Scarborough

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Re: Dupli-Color Reducer
« Reply #4 on: December 07, 2015, 07:31:18 PM »
Quote from: Steve Helmick on December 07, 2015, 05:35:16 PM
Yeah, that's what I thought! I've bought and used "lacquer thinner" from the hardware store and found it worked fine in clear dope, both Nitrate and Butyrate...as long as I didn't mind it blushing. Which I did, OBTW. Funny thing is that I don't recall ever having trouble with blushing in the '50's or '60's. I'm not real sure what brands I used (that didn't blush), but know it wasn't Aero Gloss...that stuff always gave horrid sore throats, so I learned to avoid it early on. Testors was ok, but I think I may have bought some clear butyrate from an aircraft supply place. No recall of thinner, but maybe the same source. When did SIG come out with dope? I never saw any until the '60's, at least. But then, we always lived on a remote AFB or someplace like Pullman, WA. In fact, it was Pullman, WA!  LL~ Steve
hey pullman is a great place to live,, if you dont need to buy modeling supplies
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Offline Ken Burdick

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Re: Dupli-Color Reducer
« Reply #5 on: December 08, 2015, 09:17:00 AM »
Steve-o. When we were young and had all our pretty feathers, I saw that same car run at S.I.R. (or one like it) It has the slant 6 with several< I assume 6 carbs on it. It made the best noise off the line. was pretty fast too.

Squirrel.
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Offline Fredvon4

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Re: Dupli-Color Reducer
« Reply #6 on: December 08, 2015, 11:59:24 AM »
great side step Ken

I used to run a car and bike or two at S.I.R., Spannaway, Tenino, and P.I.R  (was always curious about the INTERNATIONAL) from 1973 to 1978 (with time off for a tour of Germany)

I also recall a few Plymouth Barracuda and one did sound much different and was plenty fast

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Offline Tim Wescott

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Re: Dupli-Color Reducer
« Reply #7 on: December 08, 2015, 12:04:40 PM »
Quote from: billbyles on December 07, 2015, 02:42:54 PM
You might get away with using 100% acetone painting a very small part in low temperature but painting a car using that thinner would be a recipe for a very dry finish with low intercoat adhesion.

My cartoon brain is envisioning a car, all in primer, at the finish line, and a mostly intact paint job slowly deflating at about the 1/8 mile mark.  But, that's just me.

Quote from: Fredvon4 on December 08, 2015, 11:59:24 AM
(was always curious about the INTERNATIONAL) from 1973 to 1978 (with time off for a tour of Germany)

Everything's better with the word International in it.  That's why I have a framed xerox of my first overseas check hanging on my wall.
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Offline Steve Helmick

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Re: Dupli-Color Reducer
« Reply #8 on: December 08, 2015, 05:56:46 PM »
Quote from: Ken Burdick on December 08, 2015, 09:17:00 AM
Steve-o. When we were young and had all our pretty feathers, I saw that same car run at S.I.R. (or one like it) It has the slant 6 with several< I assume 6 carbs on it. It made the best noise off the line. was pretty fast too.

Squirrel.

Naw, this one is "their" spare daily driver. It got rolled and went under a (parked) 18-wheeler trailer that's on the way up Covington-Sawyer Rd., if you know that area. HE says it was diesel fuel spilled on a wet road. SHE doesn't know. I drove up there yesterday, went right by the spot, and the real deal was a sheet of water running down the road AND the POS Korean tires that were on it (can't recall which brand, Kuhmo or Hankook). I got a bit of a twitch there in my Chebby 4x4, and I was barely over the speed limit. HER daily driver is a 2nd Gen. Mazda RX-7 with a 360 Mopar V-8/Torque Flite. I would ride with her in it, maybe him, but definitely not YOU! I remember the GTO and the MG incidents vividly, sometimes in my sleep.  VD~ Steve
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"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

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