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#1 |
Registered User
Join Date: Oct 2010
Location: Central, IL
Posts: 201
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Keith or anybody else that might know:
We all know that the older models of Chevrolet (GM) like Corvettes and Camaro's had Acrylic Lacquer and later changed to Enamel. I do not know what year this happened. My question: When did the Chevrolet P/U's change over to enamel? Did all plants that made the trucks make the change all at one time or where there staggered in?? Thanks in advance-Larry ![]() |
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#2 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: Question for Keith Seymore on GM Paint
I don't recall when the change from laquer to enamel happened (probably could find out with a little research).
I can say that the changes were rolled out on a plant by plant basis, as they were ready. Too much waste to change over 7 plants all at the same instant. The changes were rolled out even within the same plant. In 1987 Line1 (pickups) at Flint Assembly was still high solid enamel but Line 2 (Blazer and Suburban) had already converted to base coat/clear coat. A similar transition occured earlier when Line 1 was still spray primer but Line 2 had installed the ELPO tanks. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#3 | |
Registered User
Join Date: Oct 2010
Location: Central, IL
Posts: 201
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Re: Question for Keith Seymore on GM Paint
Quote:
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#4 | ||
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Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: Question for Keith Seymore on GM Paint
Quote:
Quote:
K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#5 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Question for Keith Seymore on GM Paint
Any easy way to tell if its enamel or lacquer?
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#6 |
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Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: Question for Keith Seymore on GM Paint
Find a spot no one will see like under a door panel and take a rag with a little bit lacquer thinner rub it on the paint.If its lacquer some of it will dissolve and show the paint color on the rag.If no color then its got a clear coat and it might wrinkle it so do it somewhere no one will see it.
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#7 |
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Join Date: Jul 2007
Location: Ontario Canada
Posts: 1,006
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Re: Question for Keith Seymore on GM Paint
Have painted tons of squares, none were ever painted in lacquer paint. Even 67-72 were all enamel, before that I don't know.
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#8 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: Question for Keith Seymore on GM Paint
After a bit more research -
It appears that lacquer was used for cars because it was more "forgiving", would "reflow" when baked, giving a nice finish without requiring highly skilled painters. The transition to Dupont's new acrylic lacquer at GM started around 1956; Soon after, it had completely supplanted the older lacquer formulations. This would be the acrylic lacquer that was what GM identified as "Magic Mirror" on the Data Plates for a time. All of my mid 60's Pontiacs were acrylic lacquer originally. There may have been some EPA/CARB motivation in the switch, but it may have been as much to do with economics and paint advances (probably OSHA too). At the factory level, they may have been trying to avoid health concerns for the guys in the paint booth. To add to the confusion CARB (the California Air Resources Board) forced GM away from the solvent based lacquers at the Calif Plants. Doesn't indicate the year but suggests prior to the 3rd gen 'bird (that was '82). One source states that Ford and Chrysler switched to enamels in the late '60s in response to Gov't air emissions rules while GM switched from solution based lacquers to high solids dispersion type lacquers. However, based on Ont Guy's response it looks like the truck platforms may have been on a different timetable than the passenger car plants. My recollection is that all of the pickups at Flint were high solids enamel by the time I started in 1979 (I don't recall any big news about a changeover at that time). K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#9 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,369
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Re: Question for Keith Seymore on GM Paint
This is from a 1963 Chevy data book
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