---
product_id: 48207963
title: "SmoothOn Moldstar 15 Slow Molding Silicone by Smooth"
brand: "smooth-on"
price: "NT$3980"
currency: TWD
in_stock: true
reviews_count: 7
category: "Smooth On"
url: https://www.desertcart.tw/products/48207963-smoothon-moldstar-15-slow-molding-silicone-by-smooth
store_origin: TW
region: Taiwan
---

# 50 min pot life 450°F heat resistant 1:1 mix ratio no scale SmoothOn Moldstar 15 Slow Molding Silicone by Smooth

**Brand:** smooth-on
**Price:** NT$3980
**Availability:** ✅ In Stock

## Summary

> 🔥 Mold your masterpiece with ease—no shortcuts, just flawless detail!

## Quick Answers

- **What is this?** SmoothOn Moldstar 15 Slow Molding Silicone by Smooth by smooth-on
- **How much does it cost?** NT$3980 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/48207963-smoothon-moldstar-15-slow-molding-silicone-by-smooth)

## 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

- • **Fast & Reliable Cure:** Fully cures in 4 hours, accelerating your creative workflow.
- • **Extended Working Time:** 50-minute pot life lets you perfect every detail without rush.
- • **Durable & Tear-Resistant:** Soft yet strong silicone rubber built to last through countless casts.
- • **Effortless Precision Mixing:** Mix 1A:1B by volume—no scale, no stress.
- • **Versatile Casting Compatibility:** Ideal for wax, gypsum, resins, concrete, and even low-temp metal alloys.

## Overview

Smooth-On Mold Star 15 is a premium platinum silicone molding rubber designed for professionals seeking durable, tear-resistant molds. With a simple 1:1 volume mix ratio and a generous 50-minute pot life, it offers ample working time without the hassle of weighing. Heat resistant up to 450°F, it supports casting a wide range of materials including wax, gypsum, resins, concrete, and low-temperature metal alloys. Its 4-hour cure time ensures quick turnaround for high-quality, long-lasting molds.

## 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.

Review: Works nicely, good detail, long cure time - 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.
Review: Great product! - I love this product, it’s brilliaht and easy to use. Although very messy, make sure you wear gloves. Just wish it wasn’t to expensive.

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 207,060 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 591 in Sculpting Moulding & Casting |
| Colour | Green |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,078) |
| Date First Available | 5 Jun. 2014 |
| Item model number | SOMoldStar15kit |
| Material Type(s) | Silicone Rubber |
| Number of pieces | 1 |
| Product Dimensions | 19.3 x 14.99 x 7.87 cm; 1.09 kg |

## Product Details

- **Brand:** Smooth-On
- **Colour:** Green
- **Item dimensions L x W x H:** 19.3 x 15 x 7.9 centimetres
- **Material:** Silicone Rubber
- **Shape:** Custom

## Images

![SmoothOn Moldstar 15 Slow Molding Silicone by Smooth - 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

### ⭐⭐⭐⭐⭐ Works nicely, good detail, long cure time
*by M***Y on 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.

### ⭐⭐⭐⭐⭐ Great product!
*by A***E on 20 August 2019*

I love this product, it’s brilliaht and easy to use. Although very messy, make sure you wear gloves. Just wish it wasn’t to expensive.

### ⭐⭐⭐⭐⭐ Review
*by S***C on 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!

## 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

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-02-09*