Register now to get rid of these ads!

POR15 vs Powdercoat

Discussion in 'The Hokey Ass Message Board' started by Mattilac, Jul 26, 2010.

  1. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,145


    I am rebuilding a Jag front end that unbolts at the frame. Total disassembly, all laid out and gonna go through the whole thing. I'm trying to decide whether to just scrape off the loose rust and POR15 it all or have the parts sandblasted then powdercoated. I was thinking about buying the Eastwood powdercoating kit so I could do everything except the crossmember at home. I guess the question is, which results in a tougher finish?

    That brings me to another question. Can springs be powdercoated since they flex?
  2. bustedlifter
    Joined: Jun 26, 2005
    Posts: 756


    The powder will flex with the springs.
  3. JeffreyJames
    Joined: Jun 13, 2007
    Posts: 16,612

    from SUGAR CITY

    If they are leave springs you are never supposed to sandblast them. You'll work harden them and they'll become brittle.
  4. Jag springs are coil.
    But the theory would be the same .
    Don't blast them.

  5. JeffreyJames
    Joined: Jun 13, 2007
    Posts: 16,612

    from SUGAR CITY

    Well I think you might be ok as long as you don't heat them up too much. I'd just hit with a wire brush and paint them either with POR or a single stage. Chrome hahah???
  6. Wolfman1
    Joined: Jul 8, 2010
    Posts: 265


    Powdercoat everything you can.
    I've got the eastwood powdercoat pro system and I'm very happy with it.
    The biggest problem with it though is having a big enough oven to do the larger parts.
    I ended up building my own oven 4'x4'x7'tall
    It's actually kind of fun powdercoating my own stuff and learning something new
  7. roundvalley
    Joined: Apr 10, 2005
    Posts: 1,773


    Just got frame and running gear back from the powder coater. Took it in at 9:00 Am and took it home at 3:00 PM. I like POR 15 but I couldn't buy it for what the powder coat cost, plus a weeks labor and wearing it for a month.
    Used powder coat on lots of spring leaves and never had any problem but I media blasted them before.
  8. Chuckles Garage
    Joined: Jun 10, 2006
    Posts: 2,366

    Chuckles Garage
    Alliance Vendor

    If I remember correctly....POR-15 degrades in the sun. It has no UV protection. You have to top coat it.
  9. JeffreyJames
    Joined: Jun 13, 2007
    Posts: 16,612

    from SUGAR CITY

  10. BlueOvalCertified
    Joined: Aug 6, 2009
    Posts: 99

    from Minnesota

    Use KBS coatings similar product but they have topcoats available to protect against UV damage. Works Great. The have demo video's on there website. So you can see results before u buy. Good Luck.
  11. Por 15 also have top coats.
    Check out their site.
  12. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,145


    I think I'm going to try my hand at powdercoating everything except the crossmember. Still up in the air on that one...

    Is surface prep the same with powdercoating as it is with painting?
  13. Big Nick
    Joined: Sep 7, 2005
    Posts: 847

    Big Nick

    Yes prep is everything! My buddy has the Eastwood kit and is very happy with it. I watched him do some small parts, they come out real nice.
  14. steveo3002
    Joined: Apr 4, 2009
    Posts: 227

    from england

    powder over blasted parts will be better than por15 over semi cleaned stuff

    por15 over blasted parts ought to be pretty durable too
  15. brucer
    Joined: Jun 5, 2008
    Posts: 332

    from western ky

    how could sandblasting a spring work harden it?
    you would have to do alot of sandblasting to work harden something.. work hardening is produced from heat and alot of it.
  16. uglydog56
    Joined: Apr 8, 2008
    Posts: 331


    I used por-15 on my frame and in the places where I had to grind it off to weld (I know, but my plan changed midstream) I couldn't remove it with a wire wheel - I had to use a grinder. It was definitely cheaper than powdercoat and stuck hard. However, the back of the frame that sees the sun is turning gray. I may paint it black after I lift the body back up.
  17. nwaringa
    Joined: Oct 1, 2009
    Posts: 173


    If you plan on driving it a lot... POR-15. Its pretty easy to repair as opposed to PC. I would also recommend Evaporust for rust removal.
  18. Satinblack
    Joined: Jan 1, 2004
    Posts: 970


    KBS Rust Seal is same as Por-15, some of the guys left Por-15 and opened KBS so I am told. Look it up on Ebay, its cheaper then Por-15 too
  19. Look up Shot peening and then you may understand.
  20. DanIam
    Joined: Apr 5, 2010
    Posts: 98


    Actually, if you are using the POR15, you just want to clean it good to make sure all the grease and dirt is off. POR15 will not adhere well to the bare metal, so don't wast your time blasting it if you are going to use POR15. They are very clear about this in their instructions.
    Joined: Jul 20, 2010
    Posts: 4

    from las vegas

    I like por-15...also I read in a car mag that you can fill small holes with fiberglass mat and por-15....never tried it though...I own a mig..I did the whole floorboard of my bel-air and the frame...stuff isnt cheep though.
  22. bobj49f2
    Joined: Jun 1, 2008
    Posts: 1,804


    POR-15 can be applied over blasted metal, it likes metal with a tooth:

    From their web site:

    Surface preparation: Rusted surfaces are best; seasoned metal and
    sandblasted surfaces are also good. Surface must be dry and free of
    grease, oil, or other foreign substances.


    : First use Marine Clean to

    clean and degrease the surface, when clean rinse with water and allow

    area to dry. Second spray Metal Ready on surface full strength, keep wet

    for 15-20 minutes then rinse with water and allow to completely dry. Use

    of “rust converter” products is not recommended as they may affect
    bonding of POR-15 to metal. POR-15 likes to adhere to surfaces with
    “tooth” rather than smooth, glossy surfaces.


    before painting. Do not shake.
    Refrigerate unused portion of POR-15 for longer shelf life.

    I am using a two part epoxy mastic to paint the frame of my Buick. It's cheaper you don't have to worry about the unused portion hardening if once you open the can.​
  23. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,145


    Man I still can't decide. I see advantages to both. POR15 can be touched up easily while powdercoat cannot. But powdercoat seems like the 'right' way to do it. Maybe its the idea of painting over rust that just sounds wrong to me. But I've never used POR before, only regular paints in which that would be a terrible idea.

    Anyone else?

    EDIT: I figured I should mention that the truck will be my daily driver for years to come, and I want the finish to be as bulletproof as possible. Build it once, build it right, kinda thing.
    Last edited: Jul 28, 2010
  24. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,145


    I guess I just need to experiment with both and see what I like better.
    Joined: Mar 20, 2008
    Posts: 295


    Powder looks better ,holds up better, you can touch it up or blend it with paint,
  26. willymakeit
    Joined: Apr 13, 2009
    Posts: 1,326


    Iran Por 15 for 3 years on a sway bar. Minor surface dimples in the paint. The problem with any of these products is if it doesnt get behind any brackets ect., it will rust anyway. Ive had powdercoated hand rails on jobsites that were starting to rust in less than a year, so I'm not a big fan of it unless you can get to everything. At least Por 15 you can pour behind something. My .02
  27. Deadbird
    Joined: Jul 28, 2005
    Posts: 1,117


    +1 on the KBS products. Works great.
  28. need louvers ?
    Joined: Nov 20, 2008
    Posts: 12,906

    need louvers ?

    You would be surprised how hard a hood becomes when some one sandblasts it before they bring it to me to punch! Work hardening sucks!
  29. Keith Berg
    Joined: Nov 12, 2009
    Posts: 30

    Keith Berg

    I have POR-15 and Powder Coating on my frame. The frame looks good but I had to do the backing plates and steering knuckles with Por-15 The powder coating cracked and the backing plates front and rear loosen up. Just got some KBS met them at the Cleveland Auto Show. Their product looks good.
  30. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,145


    Well I got the oven today. Just need the Eastwood kit now and I can start playing with the powder. I didn't know you could touch up paint over powdercoat. I guess I don't see why it would be a problem, just wouldn't look as nice. Not gonna matter for frame rails and suspension parts.

Share This Page

Register now to get rid of these ads!


Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.