---
product_id: 22727565
title: "THI-VEX - Thixotropic Agent for Thickening Smooth-On Silicone Rubbers - 1 Ounce Bottle"
brand: "smooth-on"
price: "€ 22.72"
currency: EUR
in_stock: true
reviews_count: 12
category: "Smooth On"
url: https://www.desertcart.fi/products/22727565-thi-vex-thixotropic-agent-for-thickening-smooth-on-silicone-rubbers
store_origin: FI
region: Finland
---

# Adjustable viscosity for perfect mold coats Ultra-concentrated: just a few drops needed Ideal for brush-on vertical mold applications THI-VEX - Thixotropic Agent for Thickening Smooth-On Silicone Rubbers - 1 Ounce Bottle

**Brand:** smooth-on
**Price:** € 22.72
**Availability:** ✅ In Stock

## Summary

> 🖌️ Elevate your mold game—thicken smarter, not harder!

## Quick Answers

- **What is this?** THI-VEX - Thixotropic Agent for Thickening Smooth-On Silicone Rubbers - 1 Ounce Bottle by smooth-on
- **How much does it cost?** € 22.72 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/22727565-thi-vex-thixotropic-agent-for-thickening-smooth-on-silicone-rubbers)

## 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

- • **Trusted Smooth-On Quality:** Backed by a 4.6-star rating and industry-leading silicone expertise for reliable results.
- • **Precision Thickening Power:** Transform Smooth-On silicones with customizable viscosity for flawless brush-on molds.
- • **Versatile Viscosity Tuning:** Easily adjust thickness to suit your project’s needs, from thin coats to thick layers.
- • **Minimal Usage, Maximum Control:** A tiny amount goes a long way—save material and avoid mess with every application.
- • **Optimized for Vertical Surfaces:** Stay-put formula designed specifically for vertical mold making—no more drips or leaks.

## Overview

THI-VEX is a premium thixotropic agent designed exclusively for thickening Smooth-On silicone rubbers, enabling precise viscosity control for brush-on mold applications. Just a few drops transform your silicone into a stay-put, drip-free formula perfect for vertical surfaces. Compatible with most Smooth-On silicones except Mold Max 40/60, it’s the go-to choice for professionals seeking efficiency and flawless mold coats.

## Description

THI-VEX is made especially for thickening Smooth-On silicones for vertical surface application (making brush-on molds). Different viscosities can be attained by varying the amount of THI-VEX. THI-VEX is added as a percentage of Part A and must be thoroughly mixed with Parts A and B. THI-VEX will not work with Mold Max 40 or Mold Max 60 silicones.

Review: Excellent for thickening Rebound 40 - Phenomenal stuff! Used to make a mold with Smooth on rebound 40. My first two coats without thi-vex leaked all over the table, last coat put just 3-4 drops in and stirred for a couple minutes and thickened it perfectly, last coat stayed put and didn’t waste material…excellently stuff!!!
Review: Careful. Very strong. - Use sparingly, a little goes a long way. If you see with dragon skin, start with one or two drops as it shortens cure time. Haven't used it 3nough to talk about durability but the company is know for its amazing products, so I wont doubt this one.

## Features

- Thickening Liquid For Silicone Rubber
- Thickens Smooth-On Silicones
- Use For Making Brush-On Molds
- Only a Small Amount Is Needed

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01ACABSC6 |
| Best Sellers Rank | #23,087 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #138 in Cooking & Baking Thickeners #266 in Sculpture Molding & Casting Products |
| Brand | Smooth-On |
| Color | Clear |
| Customer Reviews | 4.6 4.6 out of 5 stars (400) |
| Date First Available | January 8, 2016 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Volume | 1 Fluid Ounces |
| Item Weight | 0.96 ounces |
| Item model number | 43216-54379 |
| Manufacturer | Smooth-On, Inc. |
| Manufacturer Part Number | 43216-54379 |
| Material | Silicone |
| Material Type | Silicone |
| Number of Pieces | 1 |
| Package Dimensions | 3.5 x 1.57 x 1.3 inches |
| Package Information | Bottle |
| Size | 1 Ounce Bottle |
| Special Feature | Thixotropic, Adjustable Viscosity |
| Specific Uses For Product | Casting |
| UPC | 751635839205 |
| Viscosity | Adjustable, typically higher than original Smooth-On silicone |
| Viscosity Level | High |
| Water Resistance Level | Not Water Resistant |

## Product Details

- **Brand:** Smooth-On
- **Item Form:** Liquid
- **Material:** Silicone
- **Special Feature:** Thixotropic, Adjustable Viscosity
- **Specific Uses For Product:** Casting

## Images

![THI-VEX - Thixotropic Agent for Thickening Smooth-On Silicone Rubbers - 1 Ounce Bottle - Image 1](https://m.media-amazon.com/images/I/41otcWX7hrL.jpg)

## Questions & Answers

**Q: Is this a good thickener for use with alumilite quick set rtv silicone?**
A: The Thi-Vex is normally used to thicken brush-ons like the rebound 25 silicone which checks its tendency to flow especially when the object being molded is in the vertical. The alumilite quickset silicone is not a brush on silicone. It is meant for pouring and therefore does not need the thi-vex thickener. If you make it thicker, it will be difficult for it to copy very intricate features.I hope this helps.

**Q: Will this work with Mold Maker by Alumilite?**
A: We don't test Thi-Vex with non-Smooth-On silicones.

**Q: Part A of my smooth-on got hard, can i use this with only part B to make a mold?**
A: No, that won't work

**Q: Can I use this with OoMoo30?**
A: It will work for OoMoo30, but I had much better results using rebound 25 with the thivex

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent for thickening Rebound 40
*by A***R on November 17, 2025*

Phenomenal stuff! Used to make a mold with Smooth on rebound 40. My first two coats without thi-vex leaked all over the table, last coat put just 3-4 drops in and stirred for a couple minutes and thickened it perfectly, last coat stayed put and didn’t waste material…excellently stuff!!!

### ⭐⭐⭐⭐⭐ Careful. Very strong.
*by I***S on September 18, 2025*

Use sparingly, a little goes a long way. If you see with dragon skin, start with one or two drops as it shortens cure time. Haven't used it 3nough to talk about durability but the company is know for its amazing products, so I wont doubt this one.

### ⭐⭐⭐⭐⭐ Where has this been all my life?!?
*by P***E on December 14, 2024*

Thinking of how much silicone I’ve wasted from dripping off molds, this definitely does the job! Add a few small squirts (depending on amount of silicone) and stir for 2 minutes till you decide to add more. It’s amazing for mold making! I’ve made my silicone as thick as Vaseline and it goes on so smooth and thick, not wasting silicone and hours of having to pour more silicone to build up the mold.

## Frequently Bought Together

- THI-VEX - Thixotropic Agent for Thickening Smooth-On Silicone Rubbers - 1 Ounce Bottle
- Rebound 25 - Brushable Platinum Silicone Rubber - Gallon Unit
- Ease Release 200 Mold Release - 14 Fluid Ounce Aerosol Can

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**Shop now:** [https://www.desertcart.fi/products/22727565-thi-vex-thixotropic-agent-for-thickening-smooth-on-silicone-rubbers](https://www.desertcart.fi/products/22727565-thi-vex-thixotropic-agent-for-thickening-smooth-on-silicone-rubbers)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-01-26*