--- product_id: 305257027 title: "Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit" brand: "smooth-on" price: "AR$200763" currency: ARS in_stock: true reviews_count: 5 url: https://www.desertcart.com.ar/products/305257027-mold-star-15-slow-1a-1b-mix-by-volume-platinum store_origin: AR region: Argentina --- # 50 min pot life 450°F heat resistance 1:1 volume mix ratio Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit **Brand:** smooth-on **Price:** AR$200763 **Availability:** ✅ In Stock ## Summary > 🛠️ Mold like a pro, cast like a visionary! ## Quick Answers - **What is this?** Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit by smooth-on - **How much does it cost?** AR$200763 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/305257027-mold-star-15-slow-1a-1b-mix-by-volume-platinum) ## Best For - smooth-on enthusiasts ## Why This Product - Trusted smooth-on brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **No Vacuum Needed:** Simplify your process with a mold mix that skips vacuum degassing without compromising quality. - • **Time-Smart Workflow:** Generous 50-minute pot life and quick 4-hour cure to keep your projects moving. - • **Durable & Tear-Resistant:** Soft yet strong silicone rubber built to withstand repeated use and tough casting materials. - • **Effortless Precision Mixing:** No scales needed—just equal parts for flawless molds every time. - • **Versatile Casting Compatibility:** Perfect for wax, gypsum, resins, concrete, and even low-temp metal alloys. ## Overview Smooth-On Mold Star 15 Slow is a premium platinum silicone rubber kit designed for professional-grade mold making. Featuring a user-friendly 1:1 volume mix ratio, it cures into a soft, tear-resistant rubber with heat resistance up to 450°F. Ideal for casting a wide range of materials including wax, gypsum, resins, concrete, and low-temperature metal alloys, it offers a 50-minute pot life and a fast 4-hour cure time—perfect for efficient, high-quality production without the need for vacuum degassing. ## Description Smooth-On Mold Star 15 is an easy to use platinum silicone mold mix that cures to a soft, strong, tear resistant rubber. Mold Star 15 molds will last a long time and good for casting wax, gypsum, resins, concrete and more. Cured Mold Star rubber is heat resistant up to 450 degrees F and is suitable for casting low temperature melt metal alloys. Mold Star 15 is mixed to a 1A:1B ratio and has a pot life of 50 minutes and cure time of 4 hours. Mold Star does not require vavuum degassing & is not intended for brush on mold making. Contains 1 lb of Part A and 1 lb of Part B. ## Features - Easy to use platinum silicone mold mix - Cure to soft, strong, tear resistant rubbers - Good for casting wax, gypsum, resins, concrete and more - Pot life of 50 minutes and cure time of 4 hours - Mix ratio is 1A:1B by volume- no weighing scale necessary ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00ATDV5BQ | | Brand Name | Smooth-On | | Color | Green | | Customer Reviews | 4.6 4.6 out of 5 stars (2,120) 4.6 out of 5 stars | | Item Dimensions | 19.3 x 15 x 7.9 centimeters | | Manufacturer | Smooth-On, Inc. | | Manufacturer Part Number | 75163529244 | | Material Type | Silicone | | Model Number | SOMoldStar15kit | | Number Of Items | 1 | | Number Of Pieces | 1 | | Shape | Custom | | Unit Count | 1 Count | | Upc | 751635292413 | ## Product Details - **Brand:** Smooth-On - **Colour:** Green - **Item dimensions L x W x H:** 19.3 x 15 x 7.9 centimeters - **Material:** Silicone - **Shape:** Custom ## Images ![Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit - Image 1](https://m.media-amazon.com/images/I/41Axo7OP4YL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Are these pints? I am looking for the volume, not the weight and I can't seem to find it.** A: They are pint bottles. **Q: Is this enough to make a full set of rpg dice molds in small cups?** A: I ran out after 6 of the 7 dice. I used 4 oz cups and was barely able to make the six molds. The molds did turn out great, though! **Q: How well does this retain fine details?** A: It does a great job with details. **Q: What is the shelf life for parts A and B unmixed?** A: Hey mOWWck, the shelf life is about 1 year (usually slightly longer than that) if you do not use them. This is an approximate number and based on our experiences in keeping the products in our store. You should, however, place the products in a low humidity area to keep them longer. Do note that unused silicone last longer than unused resins before the products start gradually losing their properties (such as hardness etc.) Hope this helps and have a great day ahead!! ## Customer Reviews ### ⭐⭐⭐⭐⭐ Awesome choice for anyone, but especially for beginners *by on Reviewed in the United States 12 January 2014* I've tried a lot of molding silicones from a few brands, and so far, this one's my favorite for a handful of reasons.1. Long pot life means there's ample time to mix and pour before things start to thicken up on you. If you're like me, when you first start making your own molds, you'll find dozens of ways to screw things up. A nice long pot life means that if (or in my case, WHEN) things go haywire, you'll have plenty of time to fix things. Silicone isn't cheap, so mistakes can be expensive -- the wiggle room is nice!2. Relatively quick cure time, especially given how long you have before the mix starts to solidify. I can come home from work, pour a mold, and it's ready to use with time to spare before I need to head to bed.3. Platinum cure is always a plus. For mysterious reasons, I've had trouble with tin cure silicones and the material I usually cast (epoxy). I think post-curing tin-cure molds is supposed to solve part of the issue, but even when I've tried that, the tin-cure molds have left a slightly tacky, sticky film on the surface of my castings. I've had much better luck with platinum silicones, which actually seem to *improve* how my epoxy resin cures.4. Low viscosity means you don't get bubbles as long as you don't overmix, and the trapped air in detailed molds doesn't have shove its way through super-thick goop to break free. In other words, unlike a lot of silicones, you can get excellent results with this one without using a vacuum degassing thing-a-ma-bob.The last thing is a plus/minus: This stuff is soft, but not insanely soft. The flexibility makes it excellent for intricate stuff because you don't need Hercules hands to get your casting out of the mold. However, really soft, flexible silicone like this can also cause some problems. So here are a couple tips I learned the hard way :).1. If you'll be casting something in multiple layers, make sure you either place your mold in some kind of support shell -- a cup or a plastic bowl can work -- or make your mold with extra "buffer" rubber on the base and the sides. Why? Well, if you move the mold too much, those awesome natural silicone release properties can work against you and knock your layer loose, which means the next layer can ooze down the sides. Having something to make sure the soft mold doesn't get jostled makes all the difference.2. On a similar note, if you're going to make one mold with lots of cavities, it's probably best to time things to everything is ready to be popped out of the mold at the same time. The flexibility means it's pretty easy to accidentally knock one casting loose while trying to remove another one.All in all, a really awesome product. Highly recommended! ### ⭐⭐⭐⭐⭐ Works nicely, good detail, long cure time *by on Reviewed in the United Kingdom 18 October 2021* I used this to mold ornate chess pieces and to make some cuppboard knobs in PU resin. It mixes simply and don't have to hurry (in fact I might look for a slightly faster version). I cast using a plastic cup and a paper cyclinder as a container and both worked fine and could be removed. neither of the masters (the resin chess pieces of wooden knobs) got stuck at all. The resulting mold has good, but flexibility but is fairly dense, the knob needed a split mold to get the bulbous part out. I cast with PU resin without any mold release spray and they came out of the mold easily and the level of detail was exceptional. ### ⭐⭐⭐⭐⭐ Best mold maker *by on Reviewed in Canada 28 January 2021* This is my favorite mold maker, it doesn't harden too fast, and honestly, even if I mixed it fast and saw many bubbles, no bubbles formed for my molds. Will buy again. ## Frequently Bought Together - Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit - Smooth-Cast™ 300: Bright White, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit - Smooth-On Universal™ Mold Release Spray, 14 fl. oz. Aerosol Can --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.ar/products/305257027-mold-star-15-slow-1a-1b-mix-by-volume-platinum](https://www.desertcart.com.ar/products/305257027-mold-star-15-slow-1a-1b-mix-by-volume-platinum) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-09-12*