Mold Making by an Idiot.

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  • Will

    Smooth-on makes a 2 part liquid plastic that sets in 15min.
    Just mix 50/50 stir and you have about 2-3 min to pour.
    Nothing to be scared of :p
    Trick is when you pour ,take the back of a old paintbrush,plastic rod whatever and hold it under so the pour hits that before going in the hole.
    Helps greatly get out air bubbles

  • Will

    Smooth-on makes a 2 part liquid plastic that sets in 15min.
    Just mix 50/50 stir and you have about 2-3 min to pour.
    Nothing to be scared of :p
    Trick is when you pour ,take the back of a old paintbrush,plastic rod whatever and hold it under so the pour hits that before going in the hole.
    Helps greatly get out air bubbles

    • I’ve heard good things about smooth-on, I think I’ll have to try it out.

      • Hiflt4

        I would reccomend useing heated plasticine as the bed and placeing the model flow channels and gate into it while still warm, it leaves a very smooth finish and is very easy to remove from the original aswell as minimizing flash.

      • Hiflt4

        I would reccomend useing heated plasticine as the bed and placeing the model flow channels and gate into it while still warm, it leaves a very smooth finish and is very easy to remove from the original aswell as minimizing flash.

    • I’ve heard good things about smooth-on, I think I’ll have to try it out.

  • Will

    I had a question for you about g/s regarding mixing it more yellowish and more blueish.
    What does which do the the sculpting properties of the g/s

    • More yellow makes it a softer mix and longer to cure. More blue makes it harder but it’ll cure faster. I tend to use soft mixes for large smooth areas like armour plates and hard mixes when I need to score or sculpt small sharp details.

    • More yellow makes it a softer mix and longer to cure. More blue makes it harder but it’ll cure faster. I tend to use soft mixes for large smooth areas like armour plates and hard mixes when I need to score or sculpt small sharp details.

  • Will

    I had a question for you about g/s regarding mixing it more yellowish and more blueish.
    What does which do the the sculpting properties of the g/s

  • Also, you mentioned using play-doh, and I’ll tell you from my experience it isn’t good. The play-doh is too hard to get out of the details, it sticks to everything then it hardens too, and I used it just to let the RTV harden. I then went to regular modeling clay and with a bit of water and a clay shaper it was very easy to make a nice line around the model. Also, I glued spare sprue to the feet of the legs(I was casting a set of tru-scale legs to try) and used one to get the resin (the 2 part smooth on) in, and the other leg was the vent. The only probably I had were the very tips of the toes seemed to trap air, but with a bit of green stuff, you cant tell. Just some of my experiences with the same, hope it might help.

  • Also, you mentioned using play-doh, and I’ll tell you from my experience it isn’t good. The play-doh is too hard to get out of the details, it sticks to everything then it hardens too, and I used it just to let the RTV harden. I then went to regular modeling clay and with a bit of water and a clay shaper it was very easy to make a nice line around the model. Also, I glued spare sprue to the feet of the legs(I was casting a set of tru-scale legs to try) and used one to get the resin (the 2 part smooth on) in, and the other leg was the vent. The only probably I had were the very tips of the toes seemed to trap air, but with a bit of green stuff, you cant tell. Just some of my experiences with the same, hope it might help.

  • Erich1234562002

    also they now have liquid green stuff now dont know if that would be easier.

  • Erich1234562002

    also they now have liquid green stuff now dont know if that would be easier.

    • The Ghost

      I highly recommend not using liquid greenstuff.  I spent an hour cleaning a mold after a failed liquid GS casting.

    • The Ghost

      I highly recommend not using liquid greenstuff.  I spent an hour cleaning a mold after a failed liquid GS casting.

    • Yeah, I had my doubts about liquid Green Stuff. I still want to get a pot to try with Blu-Stuff but I don’t have much confidence in it.

    • Yeah, I had my doubts about liquid Green Stuff. I still want to get a pot to try with Blu-Stuff but I don’t have much confidence in it.

      • Erich1234562002

        I got some it worked great for small gaps with a brush ( brush was just fine after words) not sure about for molds though.

      • Erich1234562002

        I got some it worked great for small gaps with a brush ( brush was just fine after words) not sure about for molds though.

  • Guest

    Have you tried using blu-tack instead if plasticine? Also I doubt RTV will bond to pvc (lego pieces) so I’m not sure you need the release agent on them. In theory if you need a release agent, you could use glycering mixed with a drop of detergent, and it’ll come right off with water.

  • Have you tried using blu-tack instead if plasticine? Also I doubt RTV will bond to pbc (lego pieces) so I’m not sure you need the release agent on them. In theory if you need a release agent, you could use glycerin mixed with a drop of detergent, and it’ll come right off with water.

  • Jose Fabian

    Have you tried using blu-tack instead if plasticine? Also I doubt RTV will bond to pbc (lego pieces) so I’m not sure you need the release agent on them. In theory if you need a release agent, you could use glycerin mixed with a drop of detergent, and it’ll come right off with water.

  • Henry Turner

    Why didn’t you use instead of Green Stuff?

    I’m not an experienced caster, it’s a genuine question. I’d thought there quite the price difference for a material that’s mostly quite similar.

    • I assume you meant to say “Why didn’t you use resin instead of Green Stuff?”

      Back then (this is a very old post) I hated having to use resin. I’m a lot more confident with it these days but I’d still prefer to hand it off to an experienced caster with good equipment.

      • Henry Turner

        Damn, sorry! Been having keyboard problems and obviously missed the dang word.

        I meant to ask why you didn’t use milliput.

        I’ve been having bad results with it, but it seems to be the go-to material for a lot of people using push molds since it’s so cheap (compared to GS anyhow).

        • Yeah, I find Milliput good for rougher stuff like bases but it can be quite crumbly at times. I favour Magic Sculp over Milliput, it’s similar but generally better quality and I usually mix it with Green Stuff as I find the mix to have the best overall qualities (ie: soft but a bit tacky and won’t crumble).