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Thread: Tips on using POR 15?

  1. #1
    E500E Guru JC220's Avatar
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    Tips on using POR 15?

    I have just bought a POR 15 starter kit - it is a product I have never used before and quite hard to get here in Ireland. (I mail ordered it)

    I intend to use it on my 320CE restoration applied to 2x different areas. First being to treat small areas of existing surface rust on the underbody and second areas being new / clean steel repair patch areas to the underbody and internal side of these repairs to the interior (where applicable).

    On the instructions it says not to use a rust converter. My usual repair method before getting this kit was to use rust converter + Wurth Zinc paint.

    In either case I always finish the underbody repairs with stone chip and Waxoyl for appearance and protection.

    Have any members used POR15 before? Any tips for applying it and getting best results?

    What I am most curious about is does it hold up well against rust? I am worrying that if I used POR 15 VS my usual method it may not hold up as well. My rust proofing test will eventually answer my own question …. but in the interim I would be really interested in member's thoughts on POR15
    1987 w124 200 - 3.6 AMG build | 1990 w124 300E-24 | 1992 w124 500E

    1994 320CE Sportline | 1997 w140 S280 | 2007 w211 E220CDI

  2. #2
    E500E Guru nocfn's Avatar
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    Re: Tips on using POR 15?

    I have only used Miracle Paint from Uncle Kent

    I believe they are similar, rust encapsulation products. For the Miracle Paint, basically remove all flaky dusty metal, and small surrounding area. Liberally coat the area in question on both sides. If you have holes or need to bridge a gap or hole, fiberglass mesh can be used that is saturated.

    I have used that stuff as preventative for drains under the cowl or anywhere surface rust may develop into something more (think pinch welds in the trunk and back glass frames on W126)
    1994 E500
    249/275 - 8F19 or 8F32 or 8320

    1991 560 SEC
    199/268
    2014 E350 Cab 799/264

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  4. #3
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    Re: Tips on using POR 15?

    Yep, don't wear gloves and make sure you rub it in with your hands.
    Joking , wear gloves and don't get any on your hands. It will never come off and you'll be called Johnny black hands for the rest of your life ... or a couple of days at least.

    The stuff sets up like rock so avoid any bolts or screws if you ever plan to remove them. It does not hold up well to UV so use it on the underside or under the carpet, boot floor etc. They recommend wire brushing and their own 'metal prep'. I suspect it's not that effective on clean metal because it does not adhere as well , because the surface needs to be keyed.

    Last thing is that if you open a can, you want to use as much as you can within a couple of days because it will harden inside the can.

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  6. #4
    E500E Guru JC220's Avatar
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    Re: Tips on using POR 15?

    Gents that's great stuff thankyou. Wear gloves and ideally it's for well keyed / rusty surfaces. I do have the cleaner and metal prep solutions so I will read up on how to use them properly before I start.

    RE the shelf life it says 6 months after opening but ideally store in the fridge This might be a step too far for the GF. I already have w124 burlwood all over the kitchen table....
    1987 w124 200 - 3.6 AMG build | 1990 w124 300E-24 | 1992 w124 500E

    1994 320CE Sportline | 1997 w140 S280 | 2007 w211 E220CDI

  7. #5
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    Re: Tips on using POR 15?

    On doing more reading up on POR15 I am going to use it on the 320CE but only on existing rusted underbody areas. If applied to new smooth metal it can peel off in sheets even if using the pre stage preps. It is a moisture during rust encapsulation paint so I will apply to cleaned areas of existing rust only.

    If there are any pinholes at all the steel will be cut out and new hot dip galvanised steel welded in followed by 2 coats of Wurth Zinc spray over the fresh steel areas.
    1987 w124 200 - 3.6 AMG build | 1990 w124 300E-24 | 1992 w124 500E

    1994 320CE Sportline | 1997 w140 S280 | 2007 w211 E220CDI

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    Re: Tips on using POR 15?

    Zinc spray should be for weld-through applications for corrosion protection.

    POR15 prep, all loose rust removed. It needs to be free of grease/oil. If you sand an area, I think you can was hit with water and get surface corrosion for POR15 to stick better. 2 coats, follow min recoat time. Any in the cap drip edge will prevent you from ever getting the cap back off. Some use a double-layer of saran wrap. Some tape the hole edge to make sure it if paint-free when returning the top to the can.

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  10. #7
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    Re: Tips on using POR 15?

    I've read that people recommend punching a small hole in the lid of the new can, pouring out just what you are going to use then taping up the hole. This limits the amount of air the paint inside the can is exposed to hence extending the shelf life of the open can. Sound like a good idea?
    1987 w124 200 - 3.6 AMG build | 1990 w124 300E-24 | 1992 w124 500E

    1994 320CE Sportline | 1997 w140 S280 | 2007 w211 E220CDI

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    Re: Tips on using POR 15?

    Take a piece of clear Saran Wrap and put it under the lid of the can to seal it off from air, when re-sealing the can. Also, perhaps sealing it in a plastic freezer bag can help keep air away from it.

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  13. #9
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    Re: Tips on using POR 15?

    Quote Originally Posted by JC220 View Post
    If there are any pinholes at all the steel will be cut out and new hot dip galvanised steel welded in followed by 2 coats of Wurth Zinc spray over the fresh steel areas.
    Make sure you have plenty of ventilation when welding galvanized steel

    An old rubber glove works pretty well for sealing a container but don't hold your breath on it lasting too long. Here's my solution for my supercharger oil.

    Last edited by alabbasi; 3 Weeks Ago at 10:19 AM.

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  15. #10
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    Re: Tips on using POR 15?

    Just about to write the above, but Honch got it first!
    1994 E500
    249/275 - 8F19 or 8F32 or 8320

    1991 560 SEC
    199/268
    2014 E350 Cab 799/264

  16. #11
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    Re: Tips on using POR 15?

    The Saran Wrap is a trick from Dave’s Uncle Kent.

  17. #12
    E500E Guru JC220's Avatar
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    Re: Tips on using POR 15?

    This is the kit I bought. It includes the worlds smallest can of paint

    20180622_181245.jpg
    1987 w124 200 - 3.6 AMG build | 1990 w124 300E-24 | 1992 w124 500E

    1994 320CE Sportline | 1997 w140 S280 | 2007 w211 E220CDI

  18. #13
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    Re: Tips on using POR 15?

    oh yeah, forget what I said you're not going to have any problems finishing up that can

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  20. #14
    E500E Guru nocfn's Avatar
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    Re: Tips on using POR 15?

    Quote Originally Posted by gerryvz View Post
    The Saran Wrap is a trick from Dave’s Uncle Kent.

    Correct, my half pint can is still good with half in it, the plastic saved it. Now Uncle Kent has a kit for the saran wrap as well...
    1994 E500
    249/275 - 8F19 or 8F32 or 8320

    1991 560 SEC
    199/268
    2014 E350 Cab 799/264

  21. #15
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    Re: Tips on using POR 15?

    I always store shelf life limited adhesives in our garage frig. Last year's past exp.

  22. #16
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    Re: Tips on using POR 15?

    Sarah wrap came in the 90s from Marshall Booth.

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