How to Make a Silicone Mold for Concrete Casting
Тәжірибелік нұсқаулар және стиль
Making a silicone mold can be a very easy and rewarding project. This inexpensive and simple DIY project allows you to create a repeatable mold from very accessible materials. Some mold making materials can be very expensive or hard to find. Silicone and the mold-making ingredients are readily accessible to almost everyone, everywhere. In this video tutorial, you will learn how to make your own straight-pull silicone mold.
When choosing what to make a silicone mold of, there are a couple things to consider. For a straight pull mold like this one, be aware of things like overhangs and undercuts. Protrusions can make it difficult to demold concrete castings without damage or voids. The surface should be as defect free as possible, unless that is what you are specifically going for.
Silicone is very adhesive so use some kind of barrier between the item being molded and the silicone itself. Wax is painted onto the concrete item followed by a spray-on mold release agent. This will help the silicone mold decouple cleanly from the concrete item.
Mineral spirits are mixed with silicone to thin it out making it more runny (less viscous). This mix can be painted onto the surface to help pick up fine detail and ensure full silicone coverage. This technique is the first step for this mold-making project.
Silicone molds will have thinner and thicker spots depending on the item being molded. But silicone does not set when it is too thick. Corn starch mixed with silicone will make the silicone set at any thickness. It is also a thickening agent. A corn starch and silicone mixture is spread over the concrete item to in an even distribution to form the mold.
00:00 - Introduction
00:37 - Urethane molds and Silicone molds
02:48 - What type of silicone to use
03:37 - Beginning tips
04:59 - Mold release agents
06:07 - Wax barrier
07:15 - Technical steps and examples
07:49 - Applying release agent
08:11 - Avoid these for straight pull molds
09:13 - Making silicone mold
09:52 - Step 1 of 2 - silicone and mineral spirits
11:51 - Silicone slurry
13:11 - Step 2 of 2 - silicone and corn starch
13:26 - Silicone rubber paste
14:44 - Concrete base
17:02 - Mortar mix design
18:40 - Demolding process
21:58 - Silicone mold reveal
25:03 - First casting
30:30 - Demolding first cast
31:33 - First cast reveal
35:41 - How to repair a silicone mold
37:41 - Second test casting
39:56 - Second cast reveal
40:24 - Advantages of DIY silicone mold
41:05 - Colored casting
42:16 - Final reveal and conclusion
43:15 - More test samples
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#CreatingConcrete #siliconemold #howto #concreteart
Пікірлер: 17
Oh how I have been looking for someone like you. Thank you. I play with clay, concrete and epoxy. I’m done with epoxy because of temperature issues however wanted to make my own designs so got into clay to design and then decided to use the clay to then mold them into my own. You have been so helpful. Thank you so so so much!!!!!
I have only just come across your channel. As they say, you always keep on learning. I started molding statues 3 years ago just to help my wife out in her mosaic hobby. And for a little while it was just a hobby for me. Since then I have semi retired (I am 60) and making statues has become a full time business. I now have made 63 latex molds with fiberglass mother molds. It was very interesting to see what you did with the silicon. I use a similar thing to fill in the undercuts on my latex molds prior to fiber-glassing except I use a lot more corn starch to make a moldable mix. I have also used this mix to make impression molds. While, the process you have shown is something I doubt I would use it is still a very interesting process to keep at the back of my mind should the need arise and I am asked to do a number of wall plaques etc at short notice and in a minimum run. Thank you
Great day handsome. Thanks for new video. ❤
@creatingconcrete
2 ай бұрын
Thanks mom!
@careyjohnston4176
2 ай бұрын
Are you sure you meant to call me mom? LMAO
Great video!! Thanks for sharing your knowledge.
I think that concrete as a backer would be a good bit cheaper than fiberglass, even with a 50 lb bag of white sand at 10 dollars. And a lot less trouble!
it turned out to Wilson's face from Castaway
@creatingconcrete
Ай бұрын
That is exactly what I was thinking!
Thank you so much for this great video! Would I be able to use non dry modeling clay as a cast versus the concrete you used? If so, what would I do differently?
Thank you for such an in-depth instructional video! Could you do a video on molding and casting a custom olla out of concrete sometime?
@creatingconcrete
2 ай бұрын
Thank you, I am happy you are enjoying the content. Do ollas get made from concrete? I am not very familiar but the shape would sure work well for this process.
@tatsumawatson5799
Ай бұрын
@@creatingconcrete Ollas, in my understanding, are made from terracotta. Given the porousness of concrete, I've been wondering if a concrete olla would be viable. Do you have any thoughts on it?
Have you done a video on geopolymer concrete and non-fly ash mixtures in particular? I looked briefly on your channel but didn't find anything.
Question. How do you polish your concrete builds? BTW subscribed, love your Channel. I make various concrete castings but sometimes they turn out rough or flaky. I want to make them smooth
The original looks a little larger. Is there shrinkage in the mold size when using the silicone?
@creatingconcrete
2 ай бұрын
They are actually precisely the same size. There is no shrinkage whatsoever. Maybe it is a color effect from the different versions being shown