DIY Silicone Molds - Excerpt 

Silicone pulls moisture out of the air and moisture is what is needed for it to cure. Cornstarch also pulls out moisture from the air. By mixing the cornstarch in the silicone pulls in more moisture faster. The more cornstarch you use the faster the silicone cures. I have done the cornstarch method and used much more than here creating almost a clay consistency. This worked well for what I needed but it set completely in less than 10 minutes at about 1/8th inch thick so you have to work fast. I also made molds that was about 3/4 thick and was able to remove my piece from it in about 30-45 minutes. For those who want to know how I mixed it, I put a large pile of corn starch in a pan (1/2 the box) added the silicone on top and started working it like bread dough. When it gets enough cornstarch in it that it no longer sticks to clean dry hands is when I started to shape it.

BEST molds tutorial I've seen as if yet! Thanks so much

Great tutorial. Love the flap idea. Great information. Thank you

This I one of the best tutorials on mold making

Best video I’ve watched so far! Extremely helpful and informative. I’m extremely grateful. Thank you! ❤❤❤

This video's got me all fired up! Thank you!

This video was extremely helpful and detailed!!! The best one ive seen yet and I now feel confident in trying out my method using this stuff!

Cool beanz I am gonna use this method often from now on. Thank you.

That was so informative. Thank you very much.

Thank you for the knowledge you shared. I have been wanting to learn how to do this .

Best tutorial on both methods! I’ve seen some people that do videos on this and told people to use the wrong caulk, next thing you know they disable comments! 🤦🏻‍♀️

I tried using xylene as thinner for pure silicone and made a bucket full of it. I was able to pour it like water. Have to do it in a well ventilated area or outdoors though. I have also used the thinned silicone as waterproofing and applied it with a roller.

Great video! Thanks.

Great tutorial !!!!

I tried this a couple different ways, they were similar to yours but not as good. The first mold I put way to much corn starch and my mold dried heavy and hard. I made a Froot Loop mold, it worked but it was so hard, some of the wax Froot Loops came out good but it was to hard to get most of them out. Your way seems much better.. so I’m gonna give it a try! Thank you!

Wish I had watched this before trying to make my silicone molds two days ago, they are not completely dried, full of air bubbles, and not covering anything well. I did succeed in removing it without too much of the stupid paper cups staying attached (lesson learned!), and will cut it into small pieces to mix in with the rest of the unmixed expensive silicone to actually finish the first molds, but for the next ones I am definitely going for this method!

Wow! I'll do it! Thanks so much!😊

Thank u sir for sharing this nice idea...🙏🏼👏🏼

Best video I've found good work

Love this stuff. I've made molds with both methods. The corn starch one grew a pink Mold on it right away. I do refrigerate it. I have best luck with the dish soap one. The only problem I've ever had was. .if I just take pieces off a lump an put it back in the soapy water..it get hard very quickly. I usually just use a huge glop of the soapy solution silicone and squish it around and I'm goo to go!..I get good details. I want to make a mold of something that stands on a base but just not sure how to go about it. This video helps. Thank you ♡

wow! so much usefull to the point information in this video! Thank you!

thank u very much for the knowledges you share

Great video! Thank you

Found this in my search for a way to copy a wood base molding profile. Dogs chewed moldings years ago and now it is time to repair them. Thinking if I make a mold for the wood filler it will give a better result than free hand sculpting to match adjoining molding. I’m going to use your cornstarch recipe. Thanks.

You are first person I have seen do layering. Seems to make more sense for drying.

Just started using resin and don't have mold I have this 2inc wood heart that I'm going to make key chains with them and was wondering how would I make a mold for it was watching you it nice to see there are helpful tips out here

great video...have learnt this method before years ago, but got some valuable new tips...thank you

Thank you for sharing this video as well as your knowledge. I'm brand new to the idea of wanting to create a mold of something and have watched multiple videos on the topic and this was the best one that I've come across thus far. I am brand new to a painting art craft as well (I was hit by someone texting and driving, leaving me permanently disabled. Trying to find an outlet to focus on to distract me from the pain as well as fill in all the empty time and isolation) I have a 2 piece trinket box that I'd like to replicate. I think using these method, I'll be able to apply this to create a single (solid version) of the figurine, as well as taking apart the original trinket box (remove the top screwed on with a hinge) I should be able to unscrew the top, then cast a mold of the 2 separate pieces to allow me to make a trinket box where the top will just rest on the other portion (and/or will perhaps leave me the ability to adhere a small hinge)....anyway, point being.... I think I can do this, using your technique to make a mold so I can cast it using plaster so I can paint it using my new found painting technique or maybe even cast it using resin. Fingers crossed 😊

thank you for sharing

I would like to see the next step of making something using the mold

A note: Silicon uses moisture to set so you can mix in a little acrylic paint and mix , (if you can) and this will allow you to make a thick mold and cure completely through.

awesome....

I used 2 full containers like he has here and poured it into a plastic water bottle then plunged my Vaseline coated statue into the silicone and I squeezed the plastic all around, in hopes that I covered my statue fully… now, i let that sit outside over night, and then wrapped it in a heating pad on medium… I wish I had seen your video and tried your method. I am going to leave my experiment be for probably a week to make sure it is fully dried and cured before I try taking my statue out. My method is a total amateur experiment. I wanted to make a mold of this little detailed, vintage statue i have.

Yes, yes very well done indeed. Very emotional!!

Thank you very much❤

By the time you buy these ingredients used to make your silicone and factor in time and labor, your cost per pound is actually more vs an off the shelf system like OOMOO 30.

Corn starch is a thickening agent, ppl use it in rues and tons of other things to help thicken.

clear silicon is the strongest, the white/black/brown are weaker as the pigment doesnt add strength but reduces the amount of real silicon in the mix.

I've never made a mold before. I have an old hockey helmet that I have taken apart in two pieces. Each half has holes in it for screws and general venting purposes. How would this work if trying to make a mold of say one of the halfs? Is there anything that needs to he done for the holes?

I have not tried this, but I've seen other videos where naptha was used to thin the silicone. What about, instead of using the soapy silicone as a thin layer first, instead you dipped the object into thinned silicone like you were making a long candle? Or maybe painted on. The silicone should dry quickly, fill all the details, and no bubbles. At least that's how it works in my head. And after a few dips in the thinned stuff, then start with either soapy or cornstarchy silicone to finish as you did in this elegant demonstration.

Thank you

Thanks for the tutorial, very concise, I’m looking forward to trying it, can I use rice flour? Also, what can I use to make the object in this silicone molds?

What do you recommend as a diy to make a arm and hand mold. I want to make a clear resin hand mold.

I watched this as a replay, so I am not sure if you covered it, but will these molds work for resin casting? I hope so because this method will make it a ton easier to make custom molds.

I have a plaster of paris mold of a bike helmet. I need to make a silicone mold from it so i can make an acrylic poured mold of the helmet. Do i need a release agent to pull the silicone from the plaster of paris mold? Thanks

Would you recommend this method for casting a drawer pull?

Can the silicone & corn starch mold be placed directly onto untreated wood without damaging it? Or what should be used as a release agent in between? I

It's easier to mix in a pot stir in the corn flour till a dough then hand knead it till not sticky, doing it in a bag is way much harder

Oh yes, I know that vinegar smell that silicone gas. My dad was a window and door installer and used a lot of it and I remember smelling that when I would help him. It’s definitely the acetic acid, which is also in vinegar.

Great tutorial video. I want to create a mould to make face details on some egghead mannequins I have, copying from the one that does have a detailed face. How thick might I need to make it? As the face is curved, would I be better off pushing the face down into a tray of silicon-cornstarch putty. Do I need to put straight silicon on first?? Any help would be appreciated. Thanks.

Well blow me... I had no idea the silicone gun opened the tubes..

I want to make a silicone mat that fits the top of a 5'x3'6" table. Would you suggest this or the store bought silicone (the 2 part style silicone)?

Ah thanks!

Question, if you have an item attached to a wall that can’t be removed and you want to make a mold of it, can you use this technique without harming the item?

Can I bake my polymer clay in the mold or do I have to remove the clay before baking?

Corn starch is a natural thickening agent try the add it to hit weather and it clumps into clear clumps but mix it thoroughly into cold water first and then add it to your hot water stiring quickly and you get a water consistency for eggdrop soup can't explain past that but maybe it will help you draw a conclusion to why it reacts the way it does with the silicon

This is great! Thank you!

Hello, I was wondering if when making the locking mechanism if you could cut in a zigzag pattern to help lock it? Or would that not work well

How much does the silicone shrink? Some methods like using acetone to make the silicone pourable shrink 10-15% so you need to make the object 15% larger. Then the mold shrinks to the right size. Using this method I imagine there is only a little shrinkage. If you have a 3-4 month old mold, pour the object, and measure it against the original object.

Can you use that on a clear plastic item ?

Very good tutorial...and your English is very good too. This is from far the best tutorial of how to do by yourself silicone molds. Questions please: 1. Does vinegar dilute 100% silicone or other methods to make it liquid; this means to poor it for making figurine molds. 2. Can we use this method to make figurines? Thank you very much. :)

I use Mineral Spirits or Naphtha to thin down Silicon and cornstarch to accelerate setting. You can thin it down to a pourable liquid. I mix in the cornstarch into the thinners 1st to then evenly mix into the silicon to avoid clumping. Someone posted using Xylene as a thinner, I would avoid that stuff as it extremely nasty and unnecessary.

Suggestion please: I have a few serving pieces that look like hollow sculptures, a soup tureen that looks like a goose for example. They are made of a mix of metals including aluminum. I would like to line them with silicon. How can I accomplish that?

Can I use your technique on a plasticine sculpture? And would the universal mood release work on plasticine ?

Could i use the mixture to make molds to put clay in? Ty

Is there any specific kind of tube silicone you recommend for mold taking or just any yube can be used?

Question..... Can Sugar Soap be used instead of dishwashing liquid?

At 15:05 mins you comment about the vinegar smell,. Did you add vinegar at any point, ?. Thom in Scotland.

Great

Can you add onto an already dried mold to thicken it up?

I'd like to see the result of this silicon mold and what was done with it? Do you have pictures of the end product, or is it just a copy of the original?

So I was going to try this but got put off by all the warning labels on the silicone caulk - it all has fungicides and other toxic chemicals in - does your one? Or is it possible to buy just pure silicone caulk?

I want to make a set of 6 thin druzy molds that looks like Crystal to make the bottom of the coaster look Crystalle when it’s done …they’re so expensive I just wanna make my own but I don’t know what I can put it on to make it look like that beautiful diamond bottom? Any suggestions I was thinking of a sponge but how can I take it off the sponge later because it looks like it’s a sponge that creates the crystal look ?

Do you think it would be possible to make dice

Another question is if I try to make my own crystal bottom insert to go in a coaster mould will this silicone come out of that mold because it’s silicone It’s self? Another words can I use a silicone mold to make the Druzy insert?

Enjoyed watching this. I have question . I’m trying too make doll shoe soles too look like work boot . I was wondering how would construction actual metal/ plastic form to have pre silicone mold that I then use my hot glue gun too fill the mold . Sorry if this is lengthy..

I'm wanting to make doll house plates and bits, would this work, I'll be using polma clay

I am having trouble finding info for acidic acid I only found in the warning section 'methanol and ammonia are release during curing' and it says 100% silicone. Is this not the right right one?

I made some molds tonight for pillar candles, and wax melts, but the smell of the vinegar transferred, even after washing the molds. Does that wear off, eventually?

I tried the soapy water method and it didn’t work. I used the cornstarch method, because I saw it on someone else’s channel, and they kneaded it with their hands. So, I did that, and boy, it was a huge mess on my hands! I like the plastic bag kneading method. I will do that next time. But, I still wonder why I couldn’t get the soapy method to work. Is there a particular kind of dish soap to use?

👍. Silicone is hydroscopic so it requires water to cure, not air. Humidity it cures faster and the longer it's exposed to water the harder it gets till it starts to break down. This is why boats do not use silicone for repairs.

Can I use this method to make a mold that can be used to make a food item?

Another RU-vidr had a similar tutorial and turned their comments off. I was wanted to ask if when the mold is done are you able to use it for candle wax making?

Question: The water for both methods shown here ~ warm or cold?

Can this be used for epoxy resin?

are you able to add any type of "coloring" to it?

Ahhh I see , so this is how you make your DIY but plugs !.

Please let me know how I will make Small Car model Mould And cust Models with what metrials

All my silicone mixed with starch seems to shrink a lot in two weeks. It loses shape and size.

It is not possible buy 100% silicone sealant in my country. Is there an alternative ? Here, most are neutral, and you can also find a few acid silicone sealants, but even the seller don't know if those are 100% or not. Thanks !

Ok i used your method to make a mold to cast a resin dinosaur print for my daughter and making the mold went great. But i ran into a problem after i poured the resin since i used a deep pour resin i had to do a thin layer first and let it set up then poured the second layer with little trinkets inside for her. When i removed the mold it came off perfectly until it got to that first layer of resin i poured and then i had to cut the mold off in pieces. Why did the silicone bond to the first layer of resin but not the rest of it?

I'm having problems finding corn starch . Only one small box at Walmart. Tried past year and only 5 small boxes . Other stores the same issue .

Can I form this around a hard resin object, or will it destroy the resin?

Where can I set my product down while the silicone cures that it won't stick to?

Can this be used for ciment craft?

Face mold that I need to fix how would you suggest fixing it

Can you usevthese diy molds for resin casting?

I wander if it can work on clay sculptures?

Can you make a big bowl mould

I’ve been to ace and the depot, I’ve also searched online and I can’t find any silicone that cures with acetic acid. Can someone please give me a specific product? Maybe a link? Thank you