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Thread: Casting and Mold-making...

  1. #16
    4,000 rpm - entering the fun zone Paul B's Avatar
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    ImageUploadedByTapatalk1448155079.046162.jpg

    Picked this kit up today. Originally $70...my amazing wife gave me a 40% off coupon. Brought it down to $45.

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  3. #17
    Forum Sponsor revlimiter's Avatar
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    Yup! That's the Molding and Casting 101 class. Good luck and have fun! Post some results.

  4. #18
    4,000 rpm - entering the fun zone Paul B's Avatar
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    Quote Originally Posted by revlimiter View Post
    Yup! That's the Molding and Casting 101 class. Good luck and have fun! Post some results.
    Will do!! Excited for this!

    Another question... If i were to cast a hot wheels body, does it cause any damage to the original piece?

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    Forum Sponsor revlimiter's Avatar
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    Re-casting rarely damages the plug. If you damage it, you're doing something with silicone that few people in the world ever have. You know, because silicone is really really soft.

    The worst that can happen is the original (the plug) gets yucky from being half buried in clay. Careful cleaning after removing it from the clay is a good thing. You can spray it with some mold release before claying to make it easier to pull out. And, of course, you'll have to spray it again before pouring the 2nd half of the mold.

  6. #20
    4,000 rpm - entering the fun zone Paul B's Avatar
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    Casting and Mold-making...

    Awesome!! Gonna try my first stuff this week.

    Thank you so much for your help!

  7. #21
    Individual-1 ☚ ☻ ☛ Agent☣Orange's Avatar
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    I have to say...

    I didn't know about any of this but now I'm learning a little bit and eager to experiment!


    No todo que es oro brilla.

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  9. #22
    4,000 rpm - entering the fun zone Paul B's Avatar
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    Ok, here is my progress so far. Made the mold last night. Used the alumilite calculator online to find the proper amount of silicone mold/catslyst to use since its 10:1. I used an empty baby food container for my mold. Made a base in it out of clay and place my little monster truck roll bar face down in the clay. Let the silicon sit and cure overnight. Mold seems good to go today. Probably could have been made better so i will address that in the future if this piece doesn't come out usable. I will most likely go the different route for the mold box; one that has a complete flat bottom. I i think that will help the front of rollbar come out better and more crisp.

    So a half hour ago I mixed tiny (about 1/2 tsp each) amounts of resin mix and poured into the mold. Let it sit about 15 minutes (instructions say 5-10 minute demold time). Pulled it out and here is my first effort. The cast rollbar is missing the back legs , so resin mix must not have seeped into those holes.

    Attempt two of casting is happening right now. I used a dull poking tool device thingy to try and open up the holes in the mold for the back legs of the roll bar in the mold. Once i poured the resin mix back in i also used that tool to try and make sure the mix gets down there. Poured real slow and tried to clean up the exposed part of the resin.

    These tiny rollbars are such small pieces that i will probably end up getting a mix that cures a bit harder for more strength. We shall see.

    The picture shows my mold, the piece i casted without the legs and what it is supposed to look like.

    ImageUploadedByTapatalk1448396055.890130.jpg

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  11. #23
    4,000 rpm - entering the fun zone Paul B's Avatar
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    Second attenpt failed. This tome, no back legs and it broke in the middle when i was trying to remove from mold. It had set a few hours.

    I guess ill try a stronger resin for tiny part but still dont know how to get resin into the holes for the mold for the back legs of the rollbar

  12. #24
    4,000 rpm - entering the fun zone Paul B's Avatar
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    Need some advice... Would it be better or easier to mold this whole piece instead of just the tiny rollbar?

    If I were to mold the whole piece would it come out of the mold better? Is it even possible? Lol

    ImageUploadedByTapatalk1448415960.673560.jpg

  13. #25
    Forum Sponsor revlimiter's Avatar
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    You used way way too much silicone for that mold. You want far less. The thinner the mold, the easier it is to massage it while you're pouring the resin and get bubbles out.

    And you need a method of evacuating air from the far parts of the mold. An air tube or something.

    And if you demold while the resin is still pretty flexible, it won't bend and break. It'll just bend.

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  15. #26
    Forum Sponsor revlimiter's Avatar
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    Anything super tiny, thin, and delicate is really hard to mold. I'd not start with that. Start with something easy like a Star Trek communicator badge or rubber ball or a Testors model paint jar or something. Something not too high on detail. You'll drive yourself crazy trying to learn on a piece you actually WANT to duplicate.

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  17. #27
    4,000 rpm - entering the fun zone Paul B's Avatar
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    Hmmm I feel this ending without the results I'm looking for.

    Thanks for the tip Adam, Ill make a smaller mold box. Luckily I pick up my legos from my parents house on thanksgiving lol ill make a smaller mold box and try this rollbar again.

    What is the process of getting the air out?

    Only other thing other than this that I would want replicated is a truck body. Maybe Ill start with that.

    Only other option I can think of to make these rollbars is 3d printing.

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