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Another story about that auction site

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  • Another story about that auction site

    A peek at the clock told me it was just about bedtime, but I decided to give ebay a quick look. To my surprise I found several pretty good deals, but they were ending soon. Lesson #1, don't rush. If you miss one deal, another will eventually come along. But I got excited, particularly about a Revell Corvette from the 60s with a rough body but pretty good looking chassis.

    In the back of the body there was a lump of what I assumed was clay. There was also some on the front of the chassis. Not a big deal. Clay was a popular way to add weight, but it's pretty easy to remove. Lesson #2, don't assume. Here's a picture:

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    Ah, since you're not under time pressure or excited about winning an auction, you probably looked closer and longer than I did and came to the conclusion "That ain't clay". You sir, are correct!

    I first started to pick at with a screw-driver, and a few pieces did break-off, but it became obvious really fast that it wasn't clay. I then tried some needle-nose pliers, and again got a piece or two to break-off, but this stuff was rock hard and FIRMLY attached to whatever it was in contact with (both the plastic body and the aluminum chassis).

    Time to get out the Dremel. I finally found a bit that worked OK, but it was very slow going. More than anything else it looked like lead. But it was much harder. At any rate, about an hour and a half later I decided to call it quits. Here's what's left:

    Click image for larger version

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    I'm curious to know what this was, if you have any ideas please post. I've never used it, but I've heard of milli putty, and I'm wondering if that's what it was. Or maybe just metal filled epoxy?


  • #2
    It could have been a type of JB weld that has lead in it


    • #3
      It looks like it may be some type of low melting point alloy (look up Wood's metal or Rose's metal for a description) . These are usually made up of a mixture of bismuth, tin, lead and possibly some others; they melt from about 50C (120F) to 170C (340F) depending on the mix. I picked up a kilo of the very low melt stuff (about 70C) a few years ago and find it handy for casting weights as you can pour it right into a plastic chassis without damage (make sure to secure the chassis to a flat plate before casting). As it looks like yours has melted the plastic somewhat I suspect it is a higher melt temp mix.
      Last edited by GT6; March 31, 2021, 12:32 PM.