Opinions on my jewl cut placement/ choice of two silicones

Would like some feedback from the think-tank.

I'm planning on molding this Wed clay sculpt using a brush on silicone. (Hoping to get a very long life out of this mold) Im going to crystal clear it beforehand. As far as my part line goes, I'm thinking of jewel cutting a slit along The back and below the chin exactly where I marked in the photo tomake it easier to demold like a glove and invert. Any opinions?
Another thing, there's two silicon paths I can go, mold Max 30 or rebound 25.
By default I was going to use mold Max 30 since I've used it many times before as a universal silicone, just not on a particular shape like this. I had mold Max 30 in mind when I was choosing where to jewl cut the mold. Id prefer to use mold Max 30 because I'd be able to pour it all over the clay sculpt and it will  easily flow into all of the pour detail of  without using a brush too much to disturb the first layer. 
In comparison, I'm thinking I could use rebound 25 instead because it's more stretchy than mold max 30 so it will more than likely last longer given  my suggested partline location. However, Ive never used this particular silicone before.  What I've seen online is it's very viscous, so I can't necessarily pour it on like I would with mold Max. I'm afraid when I brush it on it will disturb my clay sculpture and not necessarily pick up all the pour detail or even worse push it down and deform the clay as I brush. Another downside would be because this is so flexible, I'm afraid the mold might sag a bit if I make it too thin, since I'm so used to the rigidity of mold Max 30. But I could probably combat this by just making a hell of amount of keys and strategically placing them.

Either way, Im planning on reinforcing the mold with some spandex all over, especially a strip above my jewel cut line.
What do you think of my jewel cut placement, and what are your opinions on the silicone?


  • Chris EllerbyChris Ellerby Los Angeles Admin
    HI Frederick,

    The lines you marked look good.  The Rebound 25 seems like a good option for me.  The thinner silicone will help get your details with less pressure applied when brushing it on.  You don't need to brush hard and it should not impact the sculpt, especially if it has firmed up and been coated with crystal clear.  Just use small batches, take your time, keep your first coat nice and thin, and lightly brush it into every detail.  You can also use air to help you here, either from a shop compressor or just using a large straw/tube to blow through.  This pushes the silicone around on the surface, pops bubbles, and forces it down into details.  Then just build up layers until you get to your desired thickness.    After your detail coat you can use a thickener to make a more paste-like mix to fill in deep pockets or undercuts easily.

    Best of luck!

  • Appreciate the feedback Chris. Do you have any life hacks or tricks that you use to check how thick you've made your brush up molds as you go?
  • Chris EllerbyChris Ellerby Los Angeles Admin
    edited February 2021
    Some folks like to tint each new layer a different color so they can visually see their coverage.   I usually just go by eye, and when in doubt add an extra layer.   You can also use the edges to see how thick things are getting, as long as you are applying even coats with consistent coverage. 

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