USC all-metal coming off in pieces

Discussion in 'Body Restoration' started by olstyle, Nov 6, 2008.

  1. olstyle

    olstyle Veteran Member Lifetime Gold Member

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    Picked up a quart of UCS all-metal after work today and started filling the wheel well lips on both quarters. Everthing was going great untill the filler started coming off in peices when sanding. I read all directions on can first. I am sanding with my DA sander with 120 grit stick on paper. Instructions say hard and sandable 15-20 minutes. I gave it well over an hour before starting to sand. 65 degrees in the garage, so I don't think it is to cold.
    The first pic things are going great, 2nd pic, pieces started coming off while sanding. So I figured I would try the other side and see what happens. The 3rd and 4th pics are big pieces that came off when just touching the sander to it. There are some other spots I can peel off with my finger nail and other spots I can not buge with a screw driver. What gives?

    What did I do wrong?
    Please help

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  2. 70ish camaro

    70ish camaro Veteran Member

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    this is just a thought guy....

    did you make sure the area to be done was free of oil, dirt, loose welds, moisture and whatnot? even oil off your skin can cause problems. i would use a solvent of some kind (i used eastwoods PRE or like a 3m cleaner) to get all that invisible oils off the metal. also was the are you area filling have to be pre sanded for adhesion purposes?

    maybe some other will chime in....

    mike
    :bowtie:
     
    Last edited: Nov 6, 2008
  3. POS71RS

    POS71RS Moderator Staff Member Lifetime Gold Member

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    Hard to say...

    But what 'tooth' did you leave on the metal for the filler to stick to?.. You need a good amount of traction, usually hitting it with <180 is the way to go.
    Did you basecoat the metal with something?.. primer?... OIL?...
     
  4. olstyle

    olstyle Veteran Member Lifetime Gold Member

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    Surface is bare metal. Welds ground down with my angle grinder then sanded with 2" 60 grit roloc.

    Maybe I shoud have wiped clean with laquer thinner before filling? Never thought about oil from my fingers.
    Could it be as simple as oil from my fingers?
     
    Last edited: Nov 6, 2008
  5. krabben1

    krabben1 Veteran Member Lifetime Gold Member

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    Yeh,I usually wipe down with acetone or at least denatured alcohol.Ive got a habit of running my fingers down the side of what I just sanded.
     
  6. olstyle

    olstyle Veteran Member Lifetime Gold Member

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    Ya I do that too(habit) but never thought wipping down before filling :(
     
  7. 70ish camaro

    70ish camaro Veteran Member

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    i think it could. depends if your an oily guy i suppose. but any kind of oil between metal and the product will cause it to fall off. if your like me your hands are permanently stained in some sort of dirt for at least a month even after showers. just think how much garbage is on them when your working on the car.:eek:

    mike
    :bowtie:
     
  8. olstyle

    olstyle Veteran Member Lifetime Gold Member

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    Very good point. I feel like such a "dork"
    Plus I am a production mechanic at work and the hand cleaner we use dries out my skin so I use hand lotion during and at the end of each day.
    So...................ya think its the lotion LMAO
     
  9. 77RS

    77RS Veteran Member Lifetime Gold Member

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    Hey Guy, did they give you a tube of hardner (activator) with the ALL Metal?
    Also, like others have said, the bare metal has to be super clean and dry. That stuff cures hard as a rock, so it shouldn't be flaking unless it's contaminated.
     
  10. krabben1

    krabben1 Veteran Member Lifetime Gold Member

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    Hey, was that an Italian joke.Cause Im Italian by saturation,german english by birth.:D
     

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