Prepping Smooth Metal for Primer
#1350400
12/12/12 04:14 PM
12/12/12 04:14 PM
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Joined: Aug 2010
Posts: 428 Oakville, Ontario, Canada
CDN72SE
OP
mopar
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OP
mopar
Joined: Aug 2010
Posts: 428
Oakville, Ontario, Canada
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Hi All, I stripped my '72 Charger which I have owned since 1986 down to bare metal and I used a bunch of 3M discs (as seen on garage floor)attached to my drill to get the job done. I don't own a compressor or paint guns or a DA sander (maybe I should invest) mainly because of funds. With kind of a half-hearted effort I used the red Scotch-Brite pads on some parts of the quarters to scuff them a bit because the metal is really really smooth. I sprayed on Spray Max's 2K Epoxy Primer, comes in a spray can. It adhere's really well except for where it is peeling off, lol. If I am going to sand by hand what grit of sandpaper should I be using or should I just make more of an effort with the Scotch-brite pads? I've done a search and didn't really find the answers I was looking for, thanks in advance for any help. The taillpanel is painted with Rust Bullet, in case you were wondering. Link to my Resto.Another pic.
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Re: Prepping Smooth Metal for Primer
[Re: DaytonaTurbo]
#1350404
12/13/12 02:26 AM
12/13/12 02:26 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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There are some decent metal etch primers sold in spray cans. I use SEM brand. For primer to block sand or to cover filler, you really do need something with a catalyst. Spraying at $23 a serving for what you have been using will add up pretty fast. A gallon of Evercoat high build "Slick sand" will cost you under $100 and easily cover the car twice. You do need an air compressor and a spray gun though. I have had decent luck using the gravity feed paint guns from Harbor Freight. They can be bought on sale for less than $20. The compressor is the most expensive part of all of this. Once you get an air compressor, you might find that you like using other air tools. I like my air ratchet, impact gun and air chisel. The blow gun also is fun to annoy the dog.
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Re: Prepping Smooth Metal for Primer
[Re: 340SHORTY]
#1350408
12/13/12 06:43 PM
12/13/12 06:43 PM
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Joined: Aug 2010
Posts: 428 Oakville, Ontario, Canada
CDN72SE
OP
mopar
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OP
mopar
Joined: Aug 2010
Posts: 428
Oakville, Ontario, Canada
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Quote:
Quote:
need to use etching primer on bare metal...
For the best results use a epoxy sealer on the bare metal. You only need etching primer on aluminiumu. After using the sealer use a fast built primer. Ive never heard of "Max's) Most of the stuff in cans is real thin. After you have the primer on sand it with 320. Respray more primer where needed. When you are happy with the smooth primer shoot the car with a sealetr like velevet seal. wait for that to dry, go over it with fine scotchbrit to remove the nibs. Air blow and clean real good and spray away with your choice of color... Good luck.
Thanks for the info, it is appreciated.
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Re: Prepping Smooth Metal for Primer
[Re: ahy]
#1350414
01/01/13 06:10 PM
01/01/13 06:10 PM
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Joined: Aug 2010
Posts: 428 Oakville, Ontario, Canada
CDN72SE
OP
mopar
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OP
mopar
Joined: Aug 2010
Posts: 428
Oakville, Ontario, Canada
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[Agree on the epoxy or self etch primer first. Some of the epoxies recommend pretty coarse paper for bare metal... down to 80 grit. I still wonder why your primer peeled. Could there have been some contamination that got on the surface? A good wipe with lacquer thinner before painting might be a good idea.] I did Soda Blast some parts of some panels, for example my front valance I mostly took down to bare with the 3M wheel and then I hit it with soda, mostly on the inner part. I then wiped it down with Dupli-Color Grease & Wax Remover and then sprayed on the primer.
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Re: Prepping Smooth Metal for Primer
[Re: ek3]
#1350415
01/01/13 06:17 PM
01/01/13 06:17 PM
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Joined: Aug 2010
Posts: 428 Oakville, Ontario, Canada
CDN72SE
OP
mopar
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OP
mopar
Joined: Aug 2010
Posts: 428
Oakville, Ontario, Canada
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Quote:
i would suggest you use 180 grit on bare metal. then wipe with pre-prep acid converter. use only a 2 part epoxy primer . the epoxy has a mechanical bond .[it needs surface texture to grab] as to air compressors. you can buy an hvlp system for $700. graco or accuspray. no need for compressor,water sep,reg, ect. just mix and spray . outstanding finish with this system . surley you will not rattle can paint the finish? get the hvlp and prime and finsh with it .
180 grit seems to be the consensus so I think I will follow the suggestion. No I'm not going to go the rattle can route with the finish after all the efforts I am making I want the end product to be decent.
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Re: Prepping Smooth Metal for Primer
[Re: GetAwayDriver]
#1350416
01/01/13 06:19 PM
01/01/13 06:19 PM
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Joined: Aug 2010
Posts: 428 Oakville, Ontario, Canada
CDN72SE
OP
mopar
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OP
mopar
Joined: Aug 2010
Posts: 428
Oakville, Ontario, Canada
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Quote:
I have an air compressor, a ton of air tools, and much experience in body/paint. I use an electric DA sander, and my $200 air DA gathers dust in my tool box.
You need to get one, less than $75. Practice using it on a junk panel.
Thanks GAD I think that I should start looking around for one.
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Re: Prepping Smooth Metal for PrimerHat
[Re: CDN72SE]
#1350418
01/02/13 01:12 AM
01/02/13 01:12 AM
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Joined: Feb 2006
Posts: 1,179 Canada
demon
super stock
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super stock
Joined: Feb 2006
Posts: 1,179
Canada
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Quote:
QUOTE [You should have metalprepped the bare metal and immediately coated it. You will have problems later.
Sheldon ]
That's kind of what I am afraid of, hopefully it's not too late.
metal prep before epoxy primer is the best method. In fact that is what Chrysler did when manufacturing our mopars. At the factory level it was refered to as bonderizing back then. Metal prep when used properly is a very important step. As for the spraybomb primers.... Leave that for the wheelbarrow resto.... Epoxy primer sticks super to sandblasted steel, metal prepped sheetmetal and well sanded paint. In fact epoxy primer sticks to most anything! But smooth sheetmetal needs some tooth for best adhesion. as for soda blast steel, that really needs to be washed with water and metal prepped or nothing will stick for long! Do not use metal prep on sandblasted steel!
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