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Old 04-13-2010, 06:20 AM
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ppg concepts opinion

hello, i have a v8/rx7 that i will be painting here pretty soon. i have been doing as much research as i can and i cam acoss this ss paint called ppg concepts which im sure your all already familiar with. this will be my first paint job. my car is a gray blue now but im going back to the factory "tender blue". but i have some questions. i have a large (nice) garage, a 12cfm @ 90 standup, and looking at some decent hplv guns on eastwood. ive proven myself to be pretty competent at most things ive tried so i'm not scared to give painting a try. this car is garage parked and stored in winter.

1. is this ss urathane the best choice for me?
2. it's ratio is 4.1.1 but still have no idea how much i will need for my (small) car.
3. im looking at getting it from tcpglobal.com as they seem to have good pricing and my factory 84rx7 color. opinions?
4. any advise you feel i could use.

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Old 04-13-2010, 06:52 AM
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Quote:
Originally Posted by slate84
hello, i have a v8/rx7 that i will be painting here pretty soon. i have been doing as much research as i can and i cam acoss this ss paint called ppg concepts which im sure your all already familiar with. this will be my first paint job. my car is a gray blue now but im going back to the factory "tender blue". but i have some questions. i have a large (nice) garage, a 12cfm @ 90 standup, and looking at some decent hplv guns on eastwood. ive proven myself to be pretty competent at most things ive tried so i'm not scared to give painting a try. this car is garage parked and stored in winter.

1. is this ss urathane the best choice for me?
2. it's ratio is 4.1.1 but still have no idea how much i will need for my (small) car.
3. im looking at getting it from tcpglobal.com as they seem to have good pricing and my factory 84rx7 color. opinions?
4. any advise you feel i could use.
If that is a metallic color I would suggest using bc/cc. A lot easier for a learner to use. Use the base coat from PPG then switch to SPI clear for the clear coat. That will no be a lot more $ and the results will be better with greater longevity.
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Old 04-13-2010, 07:18 AM
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could you give some specific names and maybe a address for the recomended products?
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Old 04-13-2010, 07:58 AM
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Southern Polyurethane

Vince
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Old 04-13-2010, 01:04 PM
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Old 04-13-2010, 01:51 PM
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i use concept ss for color and spi universal clear . both are excellent products.
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Old 04-13-2010, 01:56 PM
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I just used the PPG Concept paint on a job, because the owner had already bought it. I found it to be the most unstable urethane I ever have used. I think it would be okay, if you can spray a perfect finish the first time. Maybe I'm stupid, but I've never been able to do that.

The problem might be in the clear only. I never saw any indication the basecoats were responsible.

I gave it twice my normal drying time, but when I tried to sand and buff, it would continue to shrink afterward, exposing the orange peel and a couple runs I had previously sanded out....so I recleared it with a stable paint I've used for 15 years, but doing that allowed it to absorb some reducer, and reexpose the problem....then after drying six months, I tried to sand and buff the new clear, but if I buffed too fast, the PPG underneath would get lumpy like cottage cheeze.

I have done hundreds of jobs, and tried all of the major brands over the last 40+ years. This was the worst urethane I ever used. My normal system is R-M, and it performs flawlessly every time. I let it dry two days, then I can do anything I want to it, and it does not move...ever!

The funny part is that I quit using PPGs Deltron in the '90s for the opposite reason. It set too quick, and even an overnight dry would make it so hard, it double my hours to sand and buff. This one seems to be the opposite.... but never really becomes stable.
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Old 04-13-2010, 02:52 PM
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strange , never had a problem. did 3 coats and blocked with 600 then 2 more . next day i shot 3 coats uv clear then blocked and shot 3 more. car has been in the sun and still no shrinkage. i've done many black cars in ppg ss .
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Old 04-13-2010, 03:07 PM
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Shine, I'm curious which clear you used. I see you did not recommend the Concept clear. I will stick with my tried and true combo, but don't want to give bad info out.
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Old 04-13-2010, 04:07 PM
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i used spi universal clear. i don't do production or collision so time is not the determining factor. urethane's pretty much all act the same. concept has 3 acc to match the 3 reducers. i don't like the supercharger. one thing i have learned is solvents are a necessary evil but not your friend. most every paint failure can be traced back to solvent or acid. i'm not a fan of base coats. still need to activate them to get a good cross link. i use epoxy / urethane color /urethane clear. these are the only solvents involved in my job. i absolutely hate ppg/dupont clears as they are all designed for 2 coats and gone production.
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Old 04-13-2010, 05:06 PM
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Maybe the number of coats was a problem. I was trying to bury the painted stripes on a Shelby Mustang clone. My R-M Diamont clear doesn't mind at all, but maybe the Concept didn't like it in the 3-6 coat range. :-)
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Old 04-13-2010, 08:02 PM
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I have only used PPG Concept twice, once was a jade green that covered very well and went on very well. The other was a red, almost Chevy orange, It also covered well and went on well. I like it, but I prefer a BC/CC.

Vince
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Old 04-14-2010, 06:40 AM
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any of the production clears were a problem if you went past 3 coats. solvent pop and dieback was bad. i did 3 coats then after it dried i blocked then did 2 more to polish. even then i would get some pop or shrinkage.
base coat is the weak link in painting. this is why many painters activate the base. you are also adding a ton of solvent in a 1:1 mix in base.
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