Smooth-On Mold Star 30 Silicone Mold Making Kit - Easy to Use & Long-Lasting Silicone Mold (2-Pound)

⭐️⭐️⭐️⭐️⭐️ Excellent Quality Silicone for Molds!. Silicone is fantastic! It’s easy to mix and pour, and it captures every fine detail perfectly. The curing time is very reasonable, and once set, the mold is strong, flexible, and durable — perfect for resin, clay work. releases cleanly, making the whole process so much easier. This silicone gives professional-quality results every time. I’ll definitely keep using it for all my future projects!

I've been following this company for quite a while and I've used some of their other products such as Body Double and the level of quality in the final molds are breathtaking. What drew me to using Mold Star 30 is not only it's easy mix ratio of 1:1 by volume (you can also mix by weight, which I did for my current project in the pictures), its low viscosity makes cast complex parts and 3d prints easy. When you get these, stir each jar VIGOROUSLY with SEPARATE mixing sticks (I used a silicone stir stick or a drill with a mixing paddle, just drill slowly)! Not using separate sticks will cause cross contamination and you'll ruin the material. I also love the colours which helps with knowing when it's mixed, you don't want streaks in it. Now, prepping your part for molding takes some planning on your part and having sulfur free plastilina clay is HIGHLY RECOMMENDED and IMPORTANT, especially on wood mold boxes. Once the two parts are mixed in a cup you have 45 minutes to pour it into the mold. And I like that because I'm not rushing to pour and 45 minutes is PLENTY of time to stir the material and ensure a proper mix. In that time, you check your dry mold, fix a few things, and even take time degassing the silicone (the vacuum pot is optional). After pouring, you'll have to wait 6 hours until it cures. I ended up sitting the mold outside overnight to cure and doing this on a hot summer night helps immensely, especially when using the cups to check on curing. It was 97°F when I poured the silicone and the leftover material was already fully cured 3 hours later! Wow. The only knock I have on this product is the pricing for a pint and the price kept fluctuating here on Amazon, but you get what you pay for. This stuff is high quality and having a few pints actually is a good thing too, so you'll actually use it. Overall, this is easy to use but the learning curve mainly hinges on how well you plan your design and your mold boxes. Also, doing this outdoors helps with odors depending on what region you're in, especially where the air is drier. Once the price falls back to normal, I'll be getting more of these. ADDENDUM: My masters are done in PLA. For those of you who are using resin printed models, make sure the resin is COMPLETELY UV CURED before using this.

This has been a go to for me for quite a while. It's somewhat thicker, so helps with leaking through the smallest spaces. Very easy to use, and I've had great luck getting a high level of detail in my molds. I really haven't had much trouble regarding quality and durability of molds I've made. I can usually get a very reasonable amount of castings before the molds start to show wear. I'm sure there is better stuff out there, but I'm very satisfied with the quality I get out of mold star.

Works great and just as advertised as long as you follow the directions. The manufacturer recommends you pour equal amounts of part A and B into separate containers, stir them, then mix together in a separate container and stir, after which they say to pour into a fourth container to finish mixing. I've made a few batches now and as long as you be sure to mix very well (no limp-wristed stirring) then you should be fine without pouring the mixture into a fourth container to finish mixing. Just scrape the sides and bottom of the container well, and the pot life is 45 minutes, so you won't run out of time mixing (not even close). The finished silicone produces a semi-hard but pliable rubber. I'd compare it to the rubber that condensation-catching mats are made from, the kind that line a bartop (can't think of a better name for them), maybe just a little harder than those though. I made a few molds for concrete out of this, and while they weren't the most intricate there were still some angles in the one-part molds that I was worried could wear or break when pulling the concrete out. The silicone has been pliable enough to remove it with some force, while still snapping back to its original shape. I'm sure on a microscopic level, all the pulling will wear it out faster, but I couldn't see anything from looking closely. If you're making a mold of something that has a few turns or twists, or strange angles, I'd recommend a two-part mold. It will also grab detail from whatever you're making the mold from, which is both good, and also something to keep in mind as any imperfections left of the surface of your positive will also be on any reproductions made from the mold.

Good products from them. Used for years.

The seller I got this from did a terribly job of packing the items. They were in rough shape when they were delivered, but the product worked just fine. The only issue is that in the part A and B containers, I received more of one than the other. So there was a wasted amount that I couldn't use, which isnt great. I hope smooth-on measures their amounts better in the future for their kits. I could have done another small mold if there was equal amounts of both parts.

Good

El color de la silicona es azul el bote B y el A beige no me sirve para nada de lo tenía pensado hacer pensé que era transparente y me he equivocado así que dinero a la basura

Easy to use, great working time and strong upon curing. It's also well worth mentioning that the level of detail you can capture with this product is mind blowing. Work as advertised, and intended which is ideally what you want for any product at the end of the day.

The product is easy to mix (use a scale), the mix of colors tells you when ready to use, it is tick enough to hold itself but will fit the tiniest crack, will cure in 4-6 hours (I added an infrared heater to help), will detach easily and remain flexible, solid and firm after curing. I use it to duplicate concrete wall stones and it works very well. NB: Make sure your structure has no leak otherwise the liquid rubber will seek through.

This stuff is the best! I'm molding small resin pieces for jewelry and displays, and using the Crystal Clear resin in the molds. I realized after two molds, that my cure time was longer because my house was a little cold. But really. It ended up with no air bubbles in it even!! I'm in love.

The product was very good to work with. It took a fair amount of time to set, so there wasn’t an issue with it setting up before I was ready. The part “A” of the mixture it very thick, and part “B” isn’t. “A” will want to sink when “B” will sit on top. So mix, mix, mix! I mixed mine quite a lot and there was still some marbling in the bottom. It didn’t affect the set up. If you have very detailed items to cast, there will be lots of bubbles. Tap the sides gently and they’ll come up. If you are planning on making multiple part molds with this product, be sure to get the Mold release. I didn’t, and had to cut my pieces apart. It worked for what I was doing, but might not for all items.