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Prepping Smooth Metal for Primer #1350400 12/12/12 04:14 PM 12/12/12 04:14 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	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.

Re: Prepping Smooth Metal for Primer [Re: CDN72SE] #1350401 12/12/12 04:27 PM 12/12/12 04:27 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	I would recommend you stop painting your body with spray cans. Spray can paint is uncatalyzed, ie no catalyst/hardener mixed in there. That's what gives epoxy primer its real bite and hardness. Now if you want to do your car in real epoxy primer, that would be the way to go. The p sheets for the type of primer used will tell you what grits the manufacturer suggests but typically for epoxy primer I sand down bare metal with 180. You can buy an electric sander instead of an air powered one. They work pretty good as well. A local auto body supply shop will be able to sell you a box of 180, round sheets with the velcro backing for your sander.

Re: Prepping Smooth Metal for Primer [Re: DaytonaTurbo] #1350402 12/12/12 05:18 PM 12/12/12 05:18 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	Thank you for the response Daytona, from what I had read on a few forums the Spray Max at about $23 a can seemed to be a good alternative, well at least to the cheap stuff from the auto parts places. It has two chambers in the can one of which contains a hardener. At this point whatever will spare me surface rust I'll try. I'll look into the electric sander option, that could be the way to go.I'm trying not to cut corners but I just get anxious at times and just wish I was driving the thing, last time on the road was 1992.

Re: Prepping Smooth Metal for Primer [Re: CDN72SE] #1350403 12/13/12 02:11 AM 12/13/12 02:11 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Never heard of that before, interesting that stuff has a hardener. I've got two of the canadian tire brand electric sanders. I've sanded down my boat and a few cars with them. No issues, they did the job and have plenty of power. I know how you feel, my car has been off the road for the past few years and I'm starting to get annoyed at not driving it!

Re: Prepping Smooth Metal for Primer [Re: DaytonaTurbo] #1350404 12/13/12 02:26 AM 12/13/12 02:26 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	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.

Re: Prepping Smooth Metal for Primer [Re: CDN72SE] #1350405 12/13/12 04:00 AM 12/13/12 04:00 AM
Joined: Jan 2003 Posts: 462 santa anna, Tx. C charles6970 mopar
charles6970 mopar C Joined: Jan 2003 Posts: 462 santa anna, Tx.	need to use etching primer on bare metal...

Re: Prepping Smooth Metal for Primer [Re: charles6970] #1350406 12/13/12 08:53 AM 12/13/12 08:53 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	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. I am truckless..

Re: Prepping Smooth Metal for Primer [Re: 340SHORTY] #1350407 12/13/12 06:40 PM 12/13/12 06:40 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	Thank you guys very much for your input much appreciated, maybe I should hold off until my bonus in February and do some shoping. Frankenduster, I can picture my wife's toy poodle going for a real ride with a blast of compressed air, lol.

Re: Prepping Smooth Metal for Primer [Re: 340SHORTY] #1350408 12/13/12 06:43 PM 12/13/12 06:43 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	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.

Re: Prepping Smooth Metal for Primer [Re: CDN72SE] #1350409 12/13/12 07:12 PM 12/13/12 07:12 PM
Joined: Nov 2004 Posts: 7,274 s.w.fl B bonefish master
bonefish master B Joined: Nov 2004 Posts: 7,274 s.w.fl	check Craigs list alot of places going out of buiness are selling their tools.if you do get a compreser DONT FORGET THE VID OF THE POODLE LAUNCH.!!!!!

Re: Prepping Smooth Metal for Primer [Re: bonefish] #1350410 12/13/12 08:53 PM 12/13/12 08:53 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	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.

Re: Prepping Smooth Metal for Primer [Re: ahy] #1350411 12/13/12 11:05 PM 12/13/12 11:05 PM
Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada R RUNCHARGER I Live Here
RUNCHARGER I Live Here R Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada	You should have metalprepped the bare metal and immediately coated it. You will have problems later. Sheldon

Re: Prepping Smooth Metal for Primer [Re: bonefish] #1350412 12/14/12 12:20 AM 12/14/12 12:20 AM
Joined: Aug 2009 Posts: 1,878 Detroit, MI GetAwayDriver top fuel
GetAwayDriver top fuel Joined: Aug 2009 Posts: 1,878 Detroit, MI	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.

Re: Prepping Smooth Metal for Primer [Re: GetAwayDriver] #1350413 12/14/12 01:51 AM 12/14/12 01:51 AM
Joined: Jun 2012 Posts: 1,899 MYRTLE BEACH SOUTH CAROLINA E ek3 top fuel
ek3 top fuel E Joined: Jun 2012 Posts: 1,899 MYRTLE BEACH SOUTH CAROLINA	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 .

Re: Prepping Smooth Metal for Primer [Re: ahy] #1350414 01/01/13 06:10 PM 01/01/13 06:10 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	[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.

Re: Prepping Smooth Metal for Primer [Re: ek3] #1350415 01/01/13 06:17 PM 01/01/13 06:17 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	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.

Re: Prepping Smooth Metal for Primer [Re: GetAwayDriver] #1350416 01/01/13 06:19 PM 01/01/13 06:19 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	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.

Re: Prepping Smooth Metal for Primer [Re: RUNCHARGER] #1350417 01/01/13 06:20 PM 01/01/13 06:20 PM
Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada CDN72SE OP mopar
CDN72SE OP mopar Joined: Aug 2010 Posts: 428 Oakville, Ontario, Canada	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.

Re: Prepping Smooth Metal for PrimerHat [Re: CDN72SE] #1350418 01/02/13 01:12 AM 01/02/13 01:12 AM
Joined: Feb 2006 Posts: 1,179 Canada D demon super stock
demon super stock D Joined: Feb 2006 Posts: 1,179 Canada	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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