Welcome to the THE H.A.M.B. forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Go Back   THE H.A.M.B. > General Discussion > The Hokey Ass Message Board

Reply
 
Thread Tools Display Modes
Old 10-11-2012, 06:17 PM   #1
GregCon
Member
 
Join Date: Jun 2012
Location: Houston
Posts: 683
Default Painting over powdercoating?

Has anyone tried painting over a powdercoated part?


I have some freshly, professionally powdercoated inner fenders that are black. I'm thinking of scuffing them up, then spraying them with a few coats of light colored epoxy primer, then a top coat of urethane white paint. Any reason this wouldn't work?
offline   Reply With Quote
Old 10-11-2012, 06:40 PM   #2
hotroddon
Old School HAMBer
 
hotroddon's Avatar
 
Join Date: Sep 2007
Location: Orange, So Cal
Posts: 11,474
Default Re: Painting over powdercoating?

When I have done some High End builds, I always powder coat the chassis and then scuff it and shoot the outside rails that show with single stage enamel and color sand and buff it. Works great and gives a better quality finish. You get the coverage and protection of powder and the finish or real paint.
__________________
As I hurtled through space, one thought kept crossing my mind
every part of this rocket was supplied by the lowest bidder. ~ John Glenn

offline   Reply With Quote
Old 10-11-2012, 06:46 PM   #3
Rich Wright
Member
 
Rich Wright's Avatar
 
Join Date: Jan 2008
Location: Nevada
Posts: 975
Default Re: Painting over powdercoating?

No reason why it won't work. Powder coating is basically electrostatically applied, oven baked paint. It's a great, fully cured surface that can be used as a base for painting, just as Hotroddon points out.
There really is no need to spray the sanded powdercoated areas with an epoxy primer unless there are flaws that you want/need to fix prior to painting.

I'd sand it thoroughly and use a none sanding sealer then the top coat...
offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-11-2012, 06:51 PM   #4
prewarcars4me
Old School HAMBer
 
prewarcars4me's Avatar
 
Join Date: Mar 2010
Location: BHC, AZ
Posts: 3,230
Default Re: Painting over powdercoating?

It adheres well. The only problem I see with that is EVERY rock chip that happens will chip paint and show up as a black spot from the powder. Past that, paint away.
__________________
Some of you guys are so tight with your money, I bet you can stretch a penny to wire your car.
offline   Reply With Quote
Old 10-11-2012, 07:59 PM   #5
GregCon
Member
 
Join Date: Jun 2012
Location: Houston
Posts: 683
Default Re: Painting over powdercoating?

OK thanks. My thought is to use the primer to help 'hide' the black so I don't need 300 coats of paint. Would the sealer do as well for that?

These are inner fenders on my '58 Chrysler, and it's only the inside (engine side) that I want white so I don't expect a lot of chips
offline   Reply With Quote
Old 10-11-2012, 08:25 PM   #6
prewarcars4me
Old School HAMBer
 
prewarcars4me's Avatar
 
Join Date: Mar 2010
Location: BHC, AZ
Posts: 3,230
Default Re: Painting over powdercoating?

Quote:
Originally Posted by GregCon View Post
OK thanks. My thought is to use the primer to help 'hide' the black so I don't need 300 coats of paint. Would the sealer do as well for that?

These are inner fenders on my '58 Chrysler, and it's only the inside (engine side) that I want white so I don't expect a lot of chips
I wouldnt worry about chips on that side, just wheel side.
__________________
Some of you guys are so tight with your money, I bet you can stretch a penny to wire your car.
offline   Reply With Quote
Old 10-11-2012, 08:27 PM   #7
Rich Wright
Member
 
Rich Wright's Avatar
 
Join Date: Jan 2008
Location: Nevada
Posts: 975
Default

Sealer will help to hide sanding scratches and also help with adhesion. If you're using a single stage urethane or acrylic enamel for the top you should not need any more than three or four coats to cover the black. Check with your paint supplier about using a white or light gray sealer, which will serve the same purpose of making it easier to cover the black while providing the benefits I listed above.


Posted from the TJJ App for iPhone & iPad
offline   Reply With Quote
Old 10-12-2012, 12:10 AM   #8
philly the greek
Senior Member
 
philly the greek's Avatar
 
Join Date: Feb 2009
Location: so . cal.
Posts: 1,408
Default Re: Painting over powdercoating?

Before I painted my frame , I had it powdercoated with epoxy primer powder, After that it was sand w/320 , then basecoat and clear .
Attached Thumbnails
Click image for larger version

Name:	IMG_2859.JPG
Views:	43
Size:	52.4 KB
ID:	1763074   Click image for larger version

Name:	IMG_2973.JPG
Views:	51
Size:	48.1 KB
ID:	1763075   Click image for larger version

Name:	IMG_2977.JPG
Views:	65
Size:	50.4 KB
ID:	1763076  

offline   Reply With Quote
Old 10-12-2012, 09:08 PM   #9
Normbc9
Senior Member
 
Join Date: Apr 2011
Location: Vacaville, CA.
Posts: 1,148
Default Re: Painting over powdercoating?

Anytime I can't make paint stick well to a metallic surface and my customer approves I send that part out for Powder Coating. I get it back and paint right over the Powder Coat. It is the best primer I have seen.
Normbc9
offline   Reply With Quote
Old 10-13-2012, 12:18 AM   #10
CutawayAl
Senior Member
 
Join Date: Aug 2009
Location: MI
Posts: 2,147
Default Re: Painting over powdercoating?

Quote:
Originally Posted by Normbc9 View Post
Anytime I can't make paint stick well to a metallic surface and my customer approves I send that part out for Powder Coating. I get it back and paint right over the Powder Coat. It is the best primer I have seen.
Normbc9
Anytime you can't get paint to the metals commonly used on automobiles it's because the surface is not prepared properly and/or contaminated with something. Powder coating has the ability to bridge over contamination and bad prep, but when that's done it still isn't adhered as it should be.
offline   Reply With Quote
Old 10-13-2012, 12:25 AM   #11
johnod
Member
 
Join Date: Aug 2009
Location: Ontario Canada
Posts: 714
Default Re: Painting over powdercoating?

Quote:
Originally Posted by philly the greek View Post
Before I painted my frame , I had it powdercoated with epoxy primer powder, After that it was sand w/320 , then basecoat and clear .

Not trying to be a smartass here.

Why wouldn't you have the frame powdercoated the finish color you wanted, instead of painting over a powdercoat primer?
offline   Reply With Quote
Old 10-13-2012, 01:10 AM   #12
hopped up
Member
 
hopped up's Avatar
 
Join Date: Oct 2009
Location: So Cal
Posts: 438
Default Re: Painting over powdercoating?

Hmm! good to know...
online   Reply With Quote
Old 10-13-2012, 01:14 AM   #13
philly the greek
Senior Member
 
philly the greek's Avatar
 
Join Date: Feb 2009
Location: so . cal.
Posts: 1,408
Default Re: Painting over powdercoating?

Quote:
Originally Posted by johnod View Post
Not trying to be a smartass here.

Why wouldn't you have the frame powdercoated the finish color you wanted, instead of painting over a powdercoat primer?
Good question . The reason that I chose to do this was because that was the product recomended by the owner of the powdercoat company. He said that the paint would adhere better than over regular powder, since it was an epoxy designed to work with painted topcoats . It's been done for 4 years now and the car has over 17K miles with no problems of chips anywhere. On my previous roadster I painted over reg. powder and did'nt have any problems either and the one thing that I did notice was that the epoxy was a little harder to sand than the reg. powder. Hope this answers your inquiry.
offline   Reply With Quote
Old 10-13-2012, 03:16 AM   #14
dad-bud
Senior Member
 
dad-bud's Avatar
 
Join Date: Aug 2009
Location: Western Australia
Posts: 1,643
Default Re: Painting over powdercoating?

Great little tech item guys. Thanks for all the posts.
I would have guessed that powdercoat would have been too hard to scuff up properly, but I was worng.
Cheers.
offline   Reply With Quote
Old 10-13-2012, 05:02 AM   #15
59bullcruiser
FNG
 
59bullcruiser's Avatar
 
Join Date: Jan 2011
Location: FLORIDA
Posts: 17
Default Re: Painting over powdercoating?

What I learned from a dude who has powder coated for a living since the late 70's.... he explained to me that you can use an adhesion promoter to paint over powder coated surfaces (he recommended BullDog) and said that you don't need to scuff the powder coat. The promoter will make paint stick like powder if sprayed correctly, it will last decades & add extreme protection from corrosion with all the extra layers. He stressed always use a UV clear coat to keep the color from fading in certain areas exposed more to sunlight.
__________________
'59 FORD Custom 300 - Straight 6
offline   Reply With Quote
Old 10-13-2012, 05:39 AM   #16
porknbeaner
Alliance Member
 
porknbeaner's Avatar
 
Join Date: Sep 2003
Location: Raytown, MO
Posts: 25,294
Default Re: Painting over powdercoating?

Quote:
Originally Posted by prewarcars4me View Post
It adheres well. The only problem I see with that is EVERY rock chip that happens will chip paint and show up as a black spot from the powder. Past that, paint away.
Paint it the same color as the powder coat problem solved. Its like using dark primer under dark paint and light primer under light paint.
__________________
If it don't make ya dirty it ain't yours

No man crosses a chasm in two jumps
offline   Reply With Quote
Old 10-13-2012, 07:46 AM   #17
gasolinescream
Member
 
gasolinescream's Avatar
 
Join Date: Sep 2010
Location: Solihull, England
Posts: 618
Default Re: Painting over powdercoating?

I tend to get any rim powdercoated before painting. There's a place near me that will blast and powdercoat rims for 25. Drop off an old crusty rim and get it back looking like new. I've normally got the powdercoat guy to coat the rims in the nearest colour to what i'm using, hit with 320 wet and dry, paint then clear. Never had a problem holding up to our shitty roads and climate.
__________________
One shot wonder
offline   Reply With Quote
Old 10-13-2012, 08:08 AM   #18
gas pumper
Old School HAMBer
 
gas pumper's Avatar
 
Join Date: Aug 2007
Location: Boonton, NJ
Posts: 2,772
Default Re: Painting over powdercoating?

We had a tube frame powder coated a couple of years ago. Talking to the shop guy, he told us that he bakes the frame while bare to cook off any oils or impurities, Lets it cool, powders it, bakes again.

His thoughs are that powder coating is just paint without the reducer/thinner.
__________________
BLASTERS&BEER

CREW: 608 AA/GL
offline   Reply With Quote
Old 10-13-2012, 08:12 AM   #19
dirt t
Senior Member
 
dirt t's Avatar
 
Join Date: Mar 2007
Location: Kingman,AZ
Posts: 2,210
Default Re: Painting over powdercoating?

Quote:
Originally Posted by hotroddon View Post
When I have done some High End builds, I always powder coat the chassis and then scuff it and shoot the outside rails that show with single stage enamel and color sand and buff it. Works great and gives a better quality finish. You get the coverage and protection of powder and the finish or real paint.
Don , what brand of enamel do you use?
Thanks
Terry
__________________
I spent most of my money on Hotrods,whiskey and women. The rest I just wasted.
offline   Reply With Quote
Old 10-13-2012, 09:47 AM   #20
marknkimberlys29
Alliance Member
 
marknkimberlys29's Avatar
 
Join Date: Aug 2010
Location: so cal
Posts: 560
Default Re: Painting over powdercoating?

Does anyone have experience using fillers over powdercoated surface?
offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 07:09 AM.