Smooth-On OOMOO™ 30 Tin Cure Silicone Rubber, Easy to Use Silicone Mold Making Kit, Pint Unit

I am a doll sculptor teaching myself how to make replica parts of my pieces to expedite production, and I've experimented with a few different products for casting parts and replicating them: none of them beat out the results I got with Smooth-On! The 1:1 ratio is very simple and while you will waste some product in your first couple of rounds, you very quickly begin to be able to eyeball the measurements per mold; I've made 5 now and I can pour without weighing the pieces, without wasting product. I began with using foam core and hot glue to create the vessels in which to pour the silicone onto the pieces, but it was very messy and time consuming; I now swear by using Lego bricks instead and wrapping the edges of them with Frog Tape to avoid leakage. I haven't had any issues with curing, perhaps because every time I pour I mix each part in their respective pots for about 30 seconds before I pour to mix them. I'll then use wooden skewers to mix them together for about a minute before preparing to pour. I use a small spatula to help get the silicone off the sides of the mixing cup as I pour, ensuring I use as much product as possible per batch. Two-part molds have been easy and amazing with this. Just be sure to use sulphur-free clay and make keys in the clay before making your first mold part. As for the second part, I have the best results with simple Vaseline; I use a cheap paintbrush to apply the Vaseline to the mold and get into every crevice. I've had molds ruined with mold release spray not working well enough, but never had a single issue separating my mold parts with Vaseline. Smooth-On also makes my favorite material to cast my molds: their Liquid Plastic! The drying time is very fast and I can easily sand off the seams with fine grit sandpaper and buff it with a polisher. If I need to patch anything up, I can use air dry epoxy clay. Overall, Smooth-On is by far the brand I trust and have had the best results with as a self-taught mold maker and sculptor!

I buy these pretty frequently for work and it's currently my favorite silicone for making molds. I've bought about 40 so far and would say about 15% arrive unusable, either from leaking or one of the components being completely coagulated (not the fault of the shipper by any means), but it's amazon so getting replacements isn't difficult, especially since here in the US they typically arrive within a few days of ordering. If you are going to do a large pour with multiple sets, make sure to give each container a shake to make sure they're all ready to use. I've had no issues with thick pours (3-4 inches thick), just make sure you shake both containers REALLY well before use and make sure it's very well mixed and it is on solid colour without streaks or spots before pouring. It cleans up very easy, if it is mixed and spills, it peals off so satisfyingly after curing. After opening, I would recommend using it all within a week. It will cure while in contact with many things other silicones won't, like wood, polymer clay, and cured silicon of the same type(I like to use previously made molds as filler to save on material, just make sure it's cleaned very well with soapy water then let dry). I mix by weight, not by volume and typically end up with extra part B After having use all that I need from a set, I like to let the remanence of part A drip into a cup until there are no drips left, then mix with the proportionate part B and let set, then that can later be used as filler material on a later mold. I RECOMEND USING A SILICON TO RESIN RELESE SPRAY IF CASTING RESIN INTO YOUR MOLD. Definitely a fan of the quality and it's pretty easy to use. Definitely recommend vacuuming after pouring to get rid of air bubbles, not always 100% necessary but it helps. I've never had a batch not turn out so if it's sticky or doesn't set, it's most likely user error. I always let it set for 24 hours, longer shouldn't be necessary. The company doesn't like giving refunds in the event of the product arriving unusable so if a return must be made, do it 100% through Amazon and not the seller. That's about all I can think of to say about it.

I tried a variety of mold making putties and rubbers available through big box craft stores, facing disappointment every time. I was hesitant to try something like this, since I had no experience working with silicone, but it's been a fantastic experience, and the only issues I've encountered were due to my negligence. While the silicone was much thicker than I expected, it takes to details beautifully, letting me replicate the tiny features of dollhouse miniatures perfectly. I haven't had issues with bubbles forming, save for my own mistake of creating a mold of a resin piece too freshly cast. The resin continued to outgas after it was covered in silicone, resulting in tiny bubbles that made that particular pour of silicone useless. It goes farther than I expected as well, and after creating 4 or 5 molds in the bottom of a cracker box, I still have 3/4ths of the containers remaining. I was concerned about one mold curing correctly because I failed to mix the bottom of the cup as thoroughly as I thought, resulting in a streaky mix of marbled blue and pink. Though it took longer for that mold to cure, it did cure properly, and I've not had any issues in the dozens of castings I've already made with it. Though the silicone mix is low-odor, I have chemical sensitivities and use an OV/P95-rated respirator when mixing and pouring, as the smell of a curing mold in my workshop did give me a headache after only a few minutes of exposure. Always make sure your work space is properly vented. Use of a respirator is encouraged in the instructions, but as many crafters overlook respiratory protection in their projects, I feel it's important to mention that it can make you sick if proper precautions are not taken! In all, I'm completely satisfied with this purchase and look forward to using it a great deal more in the future. I could have saved a great deal of time money by investing in this first, instead of being put off by a product I'd never used and considered too advanced for my uses!

I used this to make a mold of 3d printed resin master dice. I needed to use tin cure because I tried three different platinum cure silicones and all the methods of preventing cure inhibition and nothing worked even slightly despite all the evidence that it should have... But yeah, with this stuff, the whole process went easy and really well until I went to demold the masters. This silicone is VERY soft which made bending and twisting really easy. However the tear resistance is amazingly low. I brushed a thin spot lightly and the whole section straight up tore off. Then when I went to push the dice out, every single one of them tore their way out. Granted it wasn't enough to ruin the mold since all the seams seal back up when there isn't pressure being applied. But yeah, every corner tore open and a few chunks came off from apparently being a little too rough with this stuff. I got some Mold Max 14NV and the difference is night and day. The 14NV stuff is a 10:1 mixture but it was actually really easy to deal with. The mixing process was very simple. It was highly pourable too where the oomoo was THICK. And then when it was cured, the 14NV is actually difficult to tear while also being very flexible. It didn't require a vacuum chamber either which a lot of 10:1 silicones do. So yeah, if you're making molds of small parts with little detail, and you want to be able to use the mold more than once, I recommend getting the Mold Max 14NV instead of this. But for what it is, it did a decent job, so there's nothing particularly wrong with the oomoo at all. Just the application I was using it for was not right.

This worked very well for a mold made from Legos for making gummy candies. The King of Random has a pair of lego gummy candy videos (YouTube) that I started with. I changed the mold creation procedure just a bit to conserve molding material. I was able to make molds that covered one and about a half of a second 10" base plate. The larger picture on the left shows my completed molds. These were made from the full amount of this product. I changed the retaining wall height to be lower than the King's mold. The first picture on the right shows two sample Lego molds. 1-A is made the height of 2 standard bricks, like the king's mold. 1-B is the height of one and two-thirds bricks. This uses less mold material, so you can make more molds. I have three separate smaller molds only because I did not know how much more material I would have after filling the main 10" base plate mold. I plan a second set, so will know how to set up the second base plate. 1-A in the image shows a sample mold with the border being two full bricks high. 1-B shows my variation, using 1 and 2/3 height for the mold walls. The second small picture shows the difference. You don't need to make the entire wall of the 2/3 height, just a section of it that you fill to when pouring the mold. The final small mage on the right shows the depth of the base of the finished mold, and how deep it would have been for the full-two-height wall. This design allowed me to create the smaller molds and so I can make more gummies from one batch. I have used these molds to make over a dozen batches of candy. They look and feel the same as when I started. So I would give it extra points for durability. I'm having a blast with this stuff!

This is the thing: I love this product if you get a set that actually is usable. I've had a couple separate orders of this product come to me unusable - one or both bottles contain dry or somewhat dry product. This last order had part B that was watery and had chunks in it that wouldn't stir out and part A was like taffy or bubblegum (like way thicker than it is supposed to be). I should have checked these bottles before I poured my first part of my mold. I didn't (my error) thinking I had more product, I just needed to mix up more. Wasn't able to do that, so I also lost the first product that I poured in to create my mold, as it didn't cover my object all the way. This was probably half a bottle of each part, plus the new kit that was unusable. If that wasn't bad enough, I was just walking down my stairs today to drop this off at UPS and the carrying box (that the product comes in) gave out, one of the bottles hit the edge of my staircase and broke and left all that watery and chunky part B everywhere (and I rent). It was bad enough that I've had bad product, the cheap carrying box is just the nail in the coffin. I am never buying this again. I don't think it's the seller's fault. It's more of an issue with the product being super shelf-life sensitive and the company needing to use a better box for product that is pretty heavy. Bummed, but I just feel like it's a coin toss every time I buy this stuff.

Excellent stuff. Mind you, my mold-making is in its infancy, but this material is proving to be a good place to start. It mixes at a 1:1 by volume, which is helpful for those of us whose basic arithmetic is somewhat lacking (such as myself). Part A is significantly more viscous than part B. Be patient when measuring it out, as it does have a tendency to overshoot whatever it is you're trying to measure to. I've been using the lines on two separate solo cups for measuring my components. I've also been mixing in a bowl-shaped tupperware container (polypropylene). The cured rubber pulls right out of it. Be wary about using glass; the cured product stuck quite efficiently to a glass stirring rod that I used, which I'm just gonna have to take the time to scrape off. Spraying a mold release on any glass items you're using may do the trick. The rubber cures with a good flex, but still stiff enough to cut with a reasonably sharp knife. The instructions say to bake for four hours at 150F after it's cured to rid the mold of the alcohol that's produced as a by-product of the reaction. Now, a word of caution: When setting up your material for the pour, make sure you're within the bounds of one quart of liquid. Expect to go through no less than a full kit for a large mold! If you find yourself trimming off a lot of your mold, save your offcuts; they work nicely as fill for subsequent molds. The extended cure time is a godsend. Every detail comes out and there's not a single bubble on the workpiece. I molded some metal parts and found that even the particularly fine grind marks on the steel came through in the silicone. Allegedly, oomoo25 also does not require degassing, but I remain skeptical. All in all, this stuff's great. Take your time, be patient, get everything set up properly, and have fun!

I am updating this review after doing lots of research (I will keep the original review at the end of the update). Things that would be good to know: lightweight objects will float. Use glue gun or something else to keep them secured to your baseboard. The amount of material is enough for replicating a small object matching about two female fists in volume (I know, it is not very objective, fists differ in size). If in doubt, order two kits, you dont want to be out of stuff and frustrated in the middle of the project. The best application of this product is pictured on the box: making a mold of something relatively flat, like a stepping stone, or a bar of soap. Complex shape will be difficult to unmold and likely requires a different technique (at least for me. People with lots of experience will probably get very different results, but I doubt they need any reviews). Yes, I am a newbie, and I ended up basically wasting my first kit due to a lack of understanding what this product can or can`t do. I am not experienced with mold making, and I was looking for easy to use, not very expensive material to start practicing. I wanted to make a mold of a resin bird figurine, pretty simple in shape, and reproduce it in concrete later. I read the reviews and watched some tutorials online, and it seemed to be a simple and very doable project. In reality, it was much more difficult. First, the volume of the compounds is not listed. I played Archimedes, dipped my figurine in water, measured the volume, then dipped the containers, and sorted out that one set I`ve got is more than enough. So I set my workplace outside, prepared the container (the same I was measuring the volume in), put on some mold release and started mixing and pouring. First, I can`t tell what was wrong with my measurements, but something was clearly wrong, because only two thirds of the bird got covered. I could not use a smaller container, because the figurine was already barely fitting in the one I had. I had to change the plan, to take the bird out, and put in something else to avoid throwing the mix out. I did have a small clay shape that I was planning to turn into a concrete mini planter. I used this shape instead, and since some mix was lost, I also took a smaller container. Second, I was not prepared to the fact that the objects that are relatively lightweight will float up. My impression was that the mix is heavy and gooey enough to keep the objects sunk. This is not the case. My partially hollow plasticine shape was by no means very light, but lighter than the oomoo, and it kept floating up. I had to keep it down with some cardboard, and that resulted in a hole in the mold. The hole is in the bottom of the planter-to-be (if it will work in the end, I am not sure anymore), so I may be able to work around it, but this was an unpleasant surprise. Third, in the process of changing objects and containers, I created much more mess than I expected. I was prepared to be messy, but I did not realize that I need to cover the entire work area like for the paint job. Now I have stains on my outside storage bench that I can`t take off (it is not the final mix that would probably have peeled of, it is the sticky blue compound). I tried brushing the bench with Dawn and rubbing alcohol, but the stain is still there. Maybe oomoo was not a good media for my project, but I would expect to see that in the description of the product. I also think that there should be a better way to estimate how much oomoo one needs for the project. If I knew from the beginning, that the rather small bird figurine will take two sets (one and a half, but you need to buy two to get that amount), I might have gone for something else than oomoo, because that would not have met the criteria of an inexpensive project.

Great Product. Thank you.

Product is great. very little amount for the high price. Use them all at once , othervise they will dry out soon.

thank you got in good time and my project is done very happy you all did fantastic job

The product was leaking when it arrived which I did report the same day. Finally attempted to use it. So thick it was very hard to get out of the bottle. Mixing was a work out. Finally managed to make an uneven questionable mold. Resin will not cure. Super sticky on any part touching the mold. The back of the project that wasn’t touching the mold cured fine, so it’s not the pour. Waste of money on this product, resin used and time.

It couldn't be any easier to use, and the results are perfect!