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Yep. That's right. I am about to change your mold-making technique forever. This simple way of silicone mold-making will have you wanting to make cast...
By mixing a high-concentration of dish soap with water in a bowl, one is actually making a catalytic bath for your silicone. The glycerine in the dish...
Cut off the tip of the silicone caulk tube, and set it in the caulking gun. Unload enough silicone to surround the desired object, into the bath. I u...
While keeping your hand submerged in the dish-soap catalyzing bath, gently clump the string of silicone together. Form it into a ball, and slowly mass...
The best way to make sure your mold is watertight is to add a kind of thick-ish layer of silicone to the surface area of your object. Note how the din...
It will take about an hour for a full cure of your mold, before you can use it. Allow your object to remain in the mold while it cures. When the mold ...
We made a sparkly rendition of Jesus with clear casting resin and glitter. When the resin began to gel we set three LEDs inside of him. Behold the spa...
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Has anyone who has tried this method also used Smooth-On Mold Star? Smooth-On is very expensive, so finding an alternate would be great. But I'm wondering how this method compares as far as work-time and flexibility of final mold. I need to make a single part mold of something with a bounding box of about a 1' cube. So I will need to make a large amount of this molding material as well as need to cut it afterwards to extract the object and make a cast. Can anyone speak to the material's ability to be made in large quantities at a time, be cut after curing, and flexibility?
Thank you in advance
soooo...i made a mold just now, it's currently curing, and the silicone was NOT fun to get off my hands! Just a warning for those who have never used it. Any tips on how to get off the silicone?
Not sure of any easy ways of removing it, maybe try acetone.. Gloves might be a good investment :P
soapy water is to silicone as flour is to pizza dough.
Where did you buy your l.e.d.s and your resin? How long did the l.e.ds last?
Sounds like they really designed it to prevent mold! (get it? because molds)
Done this today. I'm still waiting for it to set. How long will it set? I did full object (chicken) mold. I'm planning to use clay afterwards for my chickens. Hope it will go all well.*fingers crossed
Clay will not work for this application. If you want to slip-cast, you will need to make your negative out of plaster. Plaster is porous, which sequesters the clay's water. If you still have your positive, make a plaster mold from that. If you only have the silicone negative, cast a plaster positive and then cast a plaster negative from that.
Great post! I have used this mould making technique many times so I thought I would contribute a few tips of my own. Acetic cure silicone will cure much faster that neutral cure. for speedy results use acetic cure. I would recommend a coating of soap on the hands before plunging them into the water/soap mix as the silicone can still be a bit sticky even in the soapy water. Also too much soap in the water can cause the silicone to become lumpy and not consistent. This water curing technique can also be used for direct modelling of silicone sculptures.(see photo) I usually make the sculpture in small parts and then join them together at the end. Silicone can easily be coloured for this by adding oil paint. For those commenters wanting a two part mold using this technique, build a clay barrier to seperate the halves, same as all two part mould making, and a good wax based release between the silicone halves so they don't stick together. Cheers, great instructable.
This is amazing! I can't wait to try it out. I have some questions, maybe someone knows the answers?
How did you make it a complete figure? Cast the other half and then glue? Can you cover it in two halves of silicone? What's a good way to do this?
Can you cast any material, like plaster, fine sement or molten plastic in this?
Is it a good idea to use a bit of Vaseline on the casting object to make it easier to detach or is this simple anyway with silicone?
I will be testing this out tomorrow with this product on a candy mold. It lists on the package that it can come in contact with food. http://t.homedepot.com/p/DAP-2-8-oz-Silicone-Aquarium-Sealant-00688/100128841/
Hi :) I love this instructable. I was wondering if you might know if this method of mold making would be safe to use with cooking. I would like to make some fondant molds but not sure if it is safe to put food stuff on this silicone. Thanks for sharing this project :)
DEFINITELY NOT! I think there is food safe silicone, if you need it.
Is there a limit on the thickness of the mold walls? I know that most tubes of silicone say to not exceed 1/8" thickness. Will this technique permit thicker walls?
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