---
product_id: 26721914
title: "Oomoo 25-1A:1B Mix by Volume Tin Cure Silicone Rubber - Pint Unit"
brand: "smooth on, inc."
price: "E£ 9264"
currency: EGP
in_stock: true
reviews_count: 11
category: "Smooth On"
url: https://www.desertcart.com.eg/products/26721914-oomoo-25-1a-1b-mix-by-volume-tin-cure-silicone
store_origin: EG
region: Egypt
---

# opaque blue-lavender finish 75 min fast cure 1:1 no scale mix Oomoo 25-1A:1B Mix by Volume Tin Cure Silicone Rubber - Pint Unit

**Brand:** smooth on, inc.
**Price:** E£ 9264
**Availability:** ✅ In Stock

## Summary

> 🔵 Mold faster, mix smarter, create sharper — your go-to silicone for next-level craft mastery!

## Quick Answers

- **What is this?** Oomoo 25-1A:1B Mix by Volume Tin Cure Silicone Rubber - Pint Unit by smooth on, inc.
- **How much does it cost?** E£ 9264 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.eg](https://www.desertcart.com.eg/products/26721914-oomoo-25-1a-1b-mix-by-volume-tin-cure-silicone)

## Best For

- smooth on, inc. enthusiasts

## Why This Product

- Trusted smooth on, inc. brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fast 75-Minute Cure Time:** Turn your molds around in just over an hour and keep projects moving at millennial speed.
- • **Mix by Eye, No Scale Needed:** Simplify your workflow with an effortless 1:1 volume ratio—no measuring tools required.
- • **Versatile Casting Compatibility:** Perfectly pairs with smooth-cast, plaster, resin, and even Pros-Aide transfers for multi-medium creativity.
- • **Flexible & Detail-Perfect Moldmaking:** Captures intricate details and stretches for easy demolding, making complex shapes a breeze.
- • **Room Temperature Cure with Low Viscosity:** Easy mixing and pouring without vacuum degassing—ideal for busy pros and makers.

## Overview

Oomoo 25-1A:1B is a tin-cure silicone rubber kit featuring a user-friendly 1:1 volume mix ratio that requires no scale or vacuum degassing. It cures quickly in 75 minutes at room temperature, producing flexible, opaque blue-lavender molds with excellent detail reproduction and tear strength. Ideal for professional and hobbyist moldmakers working with plaster, resin, wax, and more, it streamlines moldmaking with low viscosity and fast turnaround.

## Description

Smooth-On Oomoo 25 2 Pint Kit (contains 1 pint of part A and 1 pint of Part B) OOMOO Silicone Rubber - No Scale or Vacuum Chamber Required. OOMOO 25 is an easy to use silicone rubber compound that features a convenient one-to-one by volume mix ratio (no scale necessary). This silicone is easy to work with and has a very low viscosity for easy mixing and pouring. Vacuum degassing is usually not necessary. Takes excellent detail. Cures at room temperature with negligible shrinkage and good tear strength. OOMOO 25 features a 15-minute pot life and 75 minute cure time. OOMOO 25 & 30 are suitable for a variety of art-related and industrial applications including making molds for sculpture and prototype reproduction, casting plaster, resins and wax. Tin cure silicone. Cures to an opaque blue-lavendar. Tip: *Do not cast platinum cure silicone into Oomoo silicone or any other tin cure silicone*

Review: Get this shizz if you wanna make cool mold stuff! Its pretty freaking cool! - This stuff is freaking AWESOME! Was super skeptical since I've never done mold casting like this before. I've done fiberglass and carbon fiber, but those are pretty straight forward. And especially since I was doing it on a coated surface that I couldn't find any information on whethe or not it would stick to it. So, this stuff can beapplied over a Plasti-Dip sprayed item without it sticking to it or anything, so it worked perfect for what I needed! Making shroud extenders for a projector retrofit, and needed to make a reverse of the vacuum form piece I already made. Sprayed it with Plasti Dip as a spot evener, and this stuff didn't stick to it or even tried to pull it of. Sweet! I was worried I would get the mix ratio wrong, or mess up a step, but it's really not hard, but this stuff is a chore to mix by hand. Oh! BE SURE once you've poured A and B together and mixed that you pour into a second cup, and remix and scrape the sides and get every bit you can because the different parts WILL stick to whatever you're mixing in. When I scraped out cup #1 into cup #2 there were still parts of blue and green not mixed all the way, so it's a definite MUST. A++, 5 stars, 100% what ever, I'm impressed , and have just have to buy more for the 2nd headlight.(wasn't sure how much I was going to need, so just ordered the one) Going to also be buying their smooth cast 300 for the actual cast piece once these puppies are all set up
Review: Used to make mold for making wax masters of 3D printed part for casting - I used this material to make a silicone mold for a musket part that I wanted to have cast out of steel. To do this I had to make a wax master. I used Solid Edge CAD software to design the master, and then used it to scale the part up 3% to account for shrinkage of the steel. After filling and sanding the master smooth, I was able to pour a silicone mold around it. I used vegetable oil as a mold release agent. The silicone worked very very nice because I was not able to easily make a two-part mold for this part, and this part has undercuts that would make it hard to remove from a rigid mold. But due to the flexible nature of the silicone, once the wax solidified I could stretch the opening enough for the part to be pulled out, and then it returned to its original shape for more pouring. Being 2 parts equal volume to mix, it's very easy to mix this "by eye" without measuring. I had enough silicone to make 3 molds as seen in the picture. Few problems with bubbles, and the material conforms closely to the master and picks up all details. Sets up fast enough that you can use your mold the same day you cast it. I used a palm vibratory sander to vibrate the mold casing while the silicone was still liquid to help shake out any bubbles. Because I did not scale up the first master enough to account for shrinkage of both the steel and the wax, I am having to do this over again with a larger master. But I am buying this product again for round two! This was my first ever attempt at making a silicone mold and casting wax in it. I highly recommend this product.

## Features

- Easy to use 1:1 by volume ratio . No scale required.
- Oomoo 25 - Fast setting 75 minute cure time. For quick turnover of molds. Sets FASTER than Oomoo 30.
- Cast with smooth-cast, plaster or resin! Also Popular for use with Pros-Aide transfers!
- Great for craft moldmaking, candles, replicas, home remodeling, jewelry, and more!
- East to use, equal parts A and B. Degassing is not necessary. Cures at room temperature.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01C4YQ4TU |
| Best Sellers Rank | #69,256 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #566 in Sculpture Molding & Casting Products |
| Brand | Smooth On, Inc. |
| Color | Blue |
| Date First Available | December 4, 2013 |
| Full Cure Time | 75 Minutes |
| Global Trade Identification Number | 00751635822412 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Volume | 2 Pints |
| Item Weight | 3.15 pounds |
| Item model number | OOMOO25-2P |
| Manufacturer | Smooth-On |
| Material | Silicone |
| Package Information | Can |
| Product Dimensions | 6 x 3 x 9 inches |
| UPC | 751635822412 |
| Unit Count | 32.0 Fluid Ounces |
| Viscosity | low |
| Viscosity Level | Low |
| Water Resistance Level | Not Water Resistant |

## Product Details

- **Brand:** Smooth On, Inc.
- **Color:** Blue
- **Item Form:** Liquid
- **Item Package Quantity:** 1
- **Material:** Silicone

## Images

![Oomoo 25-1A:1B Mix by Volume Tin Cure Silicone Rubber - Pint Unit - Image 1](https://m.media-amazon.com/images/I/618qDp3TGJL.jpg)

## Questions & Answers

**Q: Can this be used to mold body parts? Hands, face, feet, etc?**
A: I do not believe this is the intended use.  It gets pretty warm.   There are other products for molding body parts available. Luna Bean -XL- Family Size Keepsake Hands Casting KIT | Clasped Group Hand Holding & Molding Kit (Cast up to 6 Hands)  or Alja-Safe Lifecasting Alginate 3-lb Box - Plaster Casting Kit
by Smooth-On

**Q: can this be used for casting tin, which melts at 450 degrees?**
A: NO! You need to use Mold Max 60

**Q: Can I use this to make a mold from a clay ?**
A: Yes, works great.
However, use a clay that does not have sulphur. There are many clays available for this use. Sulphur can inhibit the curing of the silicone.
This silicone is really great; easy to use but be careful to follow directions and use the appropriate ratio.

**Q: Which smooth-ons do you recommend for making bracelet beads that are not so shiny, like glass or pearls, but rather look like neoprene or rubber?**
A: For this, I would only recommend an FDA resin. If one person has a reaction, it could be bad and you could get sued

## Customer Reviews

### ⭐⭐⭐⭐⭐ Get this shizz if you wanna make cool mold stuff! Its pretty freaking cool!
*by K***E on August 1, 2016*

This stuff is freaking AWESOME! Was super skeptical since I've never done mold casting like this before. I've done fiberglass and carbon fiber, but those are pretty straight forward. And especially since I was doing it on a coated surface that I couldn't find any information on whethe or not it would stick to it. So, this stuff can beapplied over a Plasti-Dip sprayed item without it sticking to it or anything, so it worked perfect for what I needed! Making shroud extenders for a projector retrofit, and needed to make a reverse of the vacuum form piece I already made. Sprayed it with Plasti Dip as a spot evener, and this stuff didn't stick to it or even tried to pull it of. Sweet! I was worried I would get the mix ratio wrong, or mess up a step, but it's really not hard, but this stuff is a chore to mix by hand. Oh! BE SURE once you've poured A and B together and mixed that you pour into a second cup, and remix and scrape the sides and get every bit you can because the different parts WILL stick to whatever you're mixing in. When I scraped out cup #1 into cup #2 there were still parts of blue and green not mixed all the way, so it's a definite MUST. A++, 5 stars, 100% what ever, I'm impressed , and have just have to buy more for the 2nd headlight.(wasn't sure how much I was going to need, so just ordered the one) Going to also be buying their smooth cast 300 for the actual cast piece once these puppies are all set up

### ⭐⭐⭐⭐⭐ Used to make mold for making wax masters of 3D printed part for casting
*by S***N on January 14, 2019*

I used this material to make a silicone mold for a musket part that I wanted to have cast out of steel. To do this I had to make a wax master. I used Solid Edge CAD software to design the master, and then used it to scale the part up 3% to account for shrinkage of the steel. After filling and sanding the master smooth, I was able to pour a silicone mold around it. I used vegetable oil as a mold release agent. The silicone worked very very nice because I was not able to easily make a two-part mold for this part, and this part has undercuts that would make it hard to remove from a rigid mold. But due to the flexible nature of the silicone, once the wax solidified I could stretch the opening enough for the part to be pulled out, and then it returned to its original shape for more pouring. Being 2 parts equal volume to mix, it's very easy to mix this "by eye" without measuring. I had enough silicone to make 3 molds as seen in the picture. Few problems with bubbles, and the material conforms closely to the master and picks up all details. Sets up fast enough that you can use your mold the same day you cast it. I used a palm vibratory sander to vibrate the mold casing while the silicone was still liquid to help shake out any bubbles. Because I did not scale up the first master enough to account for shrinkage of both the steel and the wax, I am having to do this over again with a larger master. But I am buying this product again for round two! This was my first ever attempt at making a silicone mold and casting wax in it. I highly recommend this product.

### ⭐ Do not buy
*by P***A on November 19, 2024*

Part A in my first order was solidified when I opened the seal so they replaced the whole product. When I got the replacement shipment I opened the seals to make sure the product was still liquid and it was. I closed both bottles and stored them for a few months. Decided to make a mold and found part A was clumpy and drying. Stirring wasn’t possible because there was hardly any liquid left, the product was lumpy, sticky, impossible to ‘pour’ out of the bottle. I’m very disappointed and wish I could return it but it is outside of the window. I would say don’t buy unless you plan to use it soon after you buy it. This has the shortest shelf life I’ve encountered in mold making products.

## Frequently Bought Together

- Oomoo 25-1A:1B Mix by Volume Tin Cure Silicone Rubber - Pint Unit
- Smooth-Cast™ 300: Bright White, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit
- Smooth-On Universal Mold Release - 14 Fluid Ounce Aerosol Can

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*Product available on Desertcart Egypt*
*Store origin: EG*
*Last updated: 2026-03-10*