Cleaning up floorpans/trunkpan

Exterior, Paint & Bodywork

  1. jason99

    jason99 Well-Known Member

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    I have some rust on the floor and trunk pan of my project car, but nothing that seems to need more than light resurfacing and I'm trying to figure out the best way to clean it up.

    I've seen threads where people just hit it with a wire brush, some marine clean, and POR15 it, but that seems like it might be in cases where the rust is much worse.

    Should I try to use a rust dissolver as referenced in this thread Rust Dissolving liquids? or plan on attacking it by grinding with something like one of these 3M discs Rust never sleeps....

    When I do get all the rust off it, what are some options to paint/coat it? I do not have a paint gun.

    Here's a picture of the worst of the floopans and the trunk.
    IMG_0353.jpg IMG_0535.jpg
     
  2. commando1

    commando1 Old Man With a Hat on the Porch FCBO Gold Member

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    Yeow. That's pretty nasty back there.
    Attack it aggressively with a wire wheel on an angle grinder to see what you end up with first. Then make a decision on Step 2.
     
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  3. jason99

    jason99 Well-Known Member

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    I think the trunk looks worse than it actually is as I haven't had a chance to vaccum and wash that out like I did with the floorpans. As far as wire wheels, just something like this?

    upload_2018-7-31_14-17-1.png
     
  4. commando1

    commando1 Old Man With a Hat on the Porch FCBO Gold Member

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    Yep.
     
  5. MrMoparCHP

    MrMoparCHP Senior Member

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    You never know till you go at it with all sorts of tools. Follow up with a pick hammer (lite taps), you will know if it is bad.

    Before
    2010-08-30_014.jpg
    Cleaned
    2010-08-31_004.jpg
    After
    2011-04-25_001.jpg
     
  6. jason99

    jason99 Well-Known Member

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    Fair assumption that you had to cut out and replace the red section?
     
  7. MrMoparCHP

    MrMoparCHP Senior Member

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    Correct, I replaced that piece, last repair I did before handing it off. My body guy started here.

    As you can see the rest of the floor was solid and it looked as bad as yours.
    2012-08-18_011.jpg


    Alan
     
  8. jason99

    jason99 Well-Known Member

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    Started on the trunk today.

    First just hit it with a stiff bristle brush and a shop vac to get the chunks out.
    IMG-0553.JPG

    Then got after it with a 4.5in angle gringer with a polycarbonate abrasive pad from Harbor Freight. Bad lighting makes those black spots look like holes, but they aren't. There are few holes by the rearmost plugs and a few more in the upper right quadrant, all are less than a quarter inch I'd say.
    IMG-0554.JPG

    I soaked some paper towels in Evapo Rust and covered them in plastic and will let that sit for a bit to see where it ends up.
    IMG-0559.JPG

    IMG-0560.JPG
     
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  9. jason99

    jason99 Well-Known Member

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    First pass with the Evaporust, ~12hrs of soak time.

    IMG-0563.JPG
     
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  10. jason99

    jason99 Well-Known Member

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    Went at it with the angle grinder using a polycarbonate abrasive bad, a twisted wire cup, and a twisted wire wheel. Front floor pans are better than I thought, trunk is worse.

    I'm giving them all another bath with Evaporust / Metal Rescue, but after that I'm not sure what I should do to protect them. Based on what I've read hitting them with Eastwood Fast Etch, then a pre paint solvent, then primer might be the way to go for now. Thoughts?

    IMG_0572.JPG

    IMG_0573.JPG

    IMG_0574.JPG
     
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  11. HWYCRZR

    HWYCRZR Senior Member FCBO Gold Member

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    I use the Fast Etch on a lot of small parts when I am detailing to keep from flash rusting. Plus it should kill any remaining rust and leave a phosphate coating. If left on too long before rinsing with Pre it will eat the rest of your paint as well.
    I am not a primer expert, but if you will be cutting and welding patches in a welding primer should work.
     
  12. commando1

    commando1 Old Man With a Hat on the Porch FCBO Gold Member

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  13. 65sporty

    65sporty Old Man with a Hat

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    It's looking better, keep at it
     
  14. jason99

    jason99 Well-Known Member

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    Thanks for the link, there was a ton of good stuff in there.

    The way I read it you used the following process:
    1-Wire brush
    2-Skyco - OSPHO
    3-PC-7 & drywall fiberglass tape
    4-Rustoleum Deck & Concrete Restore 10x
    5-Zolatone Trunk Spatter
    6-Clearcoat

    Looks like the Ace Hardware down the street has the OSPHO, so I'll check that out.

    For your choice of PC-7, fiberglass, and deck restore, why that instead of POR-15 and fiberglass like others used? I'm trying to understand where you saw the value in the additional step/product?
     
  15. Samplingman

    Samplingman Senior Member

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    OCD.
    :rofl:
     
  16. commando1

    commando1 Old Man With a Hat on the Porch FCBO Gold Member

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    There you go.
     
  17. jason99

    jason99 Well-Known Member

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    Fair enough. Do you think your method ended up looking better, was cheaper, and/or more durable than a more direct approach?
     
  18. commando1

    commando1 Old Man With a Hat on the Porch FCBO Gold Member

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    There were only three choices.
    1. Replace the trunk pan. For me, an impossibility.
    2. Patch the trunk pan with huge sections. My welding skills would have made it look like shit.
    3. Do what I actually did. It was economical, durable and looks fantastic. It will look good for a very, very long time I think.
    You saw in that thread how every possible approach was discussed.
     
  19. jason99

    jason99 Well-Known Member

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    I should have been more specific, I definitely understand why a full replacement or welding wasn't an option. It also isn't for me.

    What I was trying to get a better handle on is why the PC7/tape/concrete coating vs POR15 + tape. I appreciate your perspective and realize I may be over analyzing this.
     
  20. commando1

    commando1 Old Man With a Hat on the Porch FCBO Gold Member

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    POR15 is a paint. I wanted something hard as steel.

    proxy.php?image=http%3A%2F%2Fi61.tinypic.com%2F2vxezb6.jpg