Body and paint guys....I need advice
#1826385
05/14/15 01:38 AM
05/14/15 01:38 AM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
OP
Banned. Forever.
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OP
Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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So I'm almost ready to shoot my 69 Charger it's original B5 blue. All of the body work is done. The whole car has been primed with a high build 2k primer, guided, and blocked with 220 on a long board. My question is, since the B5 is such a bright heavy metallic, I've been reading on the web to wetsand the primer with 400-600 before shooting the base. This seems a little too fine. I did one side of the car with 500 already and it is very smooth, almost too smooth. I'm worried about adhesion. I want to make sure the paint has something good to bite onto, but I also want to make sure the metallic flows nice and smooth. Does anybody have any experience/advice when it comes to finish sanding primer when using a metallic base?
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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Re: Body and paint guys....I need advice
[Re: 69L78Nova]
#1826402
05/14/15 02:16 AM
05/14/15 02:16 AM
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Joined: Oct 2005
Posts: 1,305 Lakewood, Colorado
herkamer
pro stock
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pro stock
Joined: Oct 2005
Posts: 1,305
Lakewood, Colorado
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600 wet is plenty enough for mechanical adhesion. It will feel smooth but the basecoat will adhere. If you shoot it over 220, you will see every sand scratch in the primer. Personally I would finish the primer with 400 wet, then use a reduced coat of epoxy primer as a sealer before basecoat. Plus the benefit of epoxy is that it will tie the coats together chemically, as well as a uniform colored ground coat.
Matt 69 Dart Swinger 340 83 W350, Megasquirted with 46RH Old news: 72 Demon street/race mobile Latest: 70 Duster backhalf car and even more
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Re: Body and paint guys....I need advice
[Re: 69L78Nova]
#1826467
05/14/15 10:07 AM
05/14/15 10:07 AM
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Joined: Apr 2005
Posts: 4,923 new berlin wisconsin
Mr T2U
master
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master
Joined: Apr 2005
Posts: 4,923
new berlin wisconsin
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what does the tech sheet recommend for final sanding?
when I daily spray PPG DBC base coat I final sand with 400 dry, 600 P grade wet is about the same, apply sealer then clear.
when wet sanding what is the grit rated? there will be a P behind the numbers for P grade. P grade is usually black and is the most readily available now. A grade is usually gray with no letters behind the numbers. P grade has coarser grit and you should use 1 grit higher than A grade paper.
perception is 90% of reality
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Re: Body and paint guys....I need advice
[Re: herkamer]
#1826468
05/14/15 10:08 AM
05/14/15 10:08 AM
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Joined: Apr 2009
Posts: 32 Tennessee
moparjunkyard
member
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member
Joined: Apr 2009
Posts: 32
Tennessee
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Not sure if your car is assembled, but I shoot all my cars dissasembled, with parts hanging especially on high metallic cars. You get a much more even flow and less chance of any light or dark areas. Once base coat is dry, I wet sand with wax and grease remover before clear coating using 600-800 grit paper. Alot of people will say not to use Wax and Grease remover but for me it works alot better than water because it flashes faster and you know it is clean and not contaminated with the garbage that your water may have in it. Be sure not to sand past your current coat of base. if you sand a metallic beyond the first coat, you will have discoloration and you will have to re-apply another base coat. Then put plenty of clear over it and if you have any issues with the clear, you can wet-sand the crap out of it as long as you dont break through it. If you break through the clear coat then you are in trouble. Here is an example of the process I do on my cars. This car was sold at Barrett Jackson a few years ago for 40 grand Barret Jackson . I painted it in my garage using this process. It was a one of one known to exist numbers matching Auto. 383 Notchback. This was a very heavy mettalic car, but as you see it is straight as an arrow and paint is immaculate. But to answer your question, 600 is good, anything less could end up with scratch marks showing up after clear.
1968 A-STOCK AUTOMATIC/426 Hemi Super Bee Numbers Matching
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Re: Body and paint guys....I need advice
[Re: 69L78Nova]
#1827167
05/15/15 11:46 AM
05/15/15 11:46 AM
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Joined: Feb 2003
Posts: 18,582 Rust Belt, SW PA
Silver70
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 18,582
Rust Belt, SW PA
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I wetsand primer with 400, good 3m or similar paper. If it's painted areas, I used 600. If you don't use something than finer than 220, your going to see it especially with a metallic color.
When wetsanded with 400, you can actually see a little shine in good light and look it over for flaws too.
68 Road Runner, 69 Belvedere, 71 Challenger Vert 340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z 66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram
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Re: Body and paint guys....I need advice
[Re: 69L78Nova]
#1829474
05/18/15 08:40 PM
05/18/15 08:40 PM
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Joined: Apr 2009
Posts: 32 Tennessee
moparjunkyard
member
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member
Joined: Apr 2009
Posts: 32
Tennessee
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Oh, By the way, Don't ever use any of that red filler in the tube like you get at the parts stores. It will shrink big time and eventually cause issues. Make sure whatever you are using is good quality fillers. On the Cuda I restored I used Evercoat Rage Extreme and I think USC Half Time for finishing filler. That was a few years back, so there is probably something better today.
1968 A-STOCK AUTOMATIC/426 Hemi Super Bee Numbers Matching
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Re: Body and paint guys....I need advice
[Re: Silver70]
#1829910
05/19/15 11:20 AM
05/19/15 11:20 AM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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I switched to rage ultra myself in the past year... not cheap at 55 a gallon, but it sands easier than polyester finishing putty. Really with it, you don't even need a finishing putty. Yup definitely a lot easier sanding, but spendy. Sands down very nice and smooth.
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Re: Body and paint guys....I need advice
[Re: 69L78Nova]
#1833200
05/24/15 12:51 PM
05/24/15 12:51 PM
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Joined: Dec 2006
Posts: 240 Shingle Springs Ca
haddixj
enthusiast
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enthusiast
Joined: Dec 2006
Posts: 240
Shingle Springs Ca
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Yep, I took a class at the local community college and he said high end paint usually will get blocked in 600, then 1000 on a soft pad
70 duster 25.1E,73 barracuda, 70 gran coupe, 71 cuda
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