---
product_id: 36519329
title: "RD8 Radiator Coolant Water Based U/V Leak Detection Dye (Self Measure Bottle), Purple, 8-Ounce Bottle"
brand: "tsi supercool"
price: "R727"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Tsi Supercool"
url: https://www.desertcart.co.za/products/36519329-rd8-radiator-coolant-water-based-u-v-leak-detection-dye
store_origin: ZA
region: South Africa
---

# Works with any UV light Purple UV-detectable dye 8 oz self-measure bottle RD8 Radiator Coolant Water Based U/V Leak Detection Dye (Self Measure Bottle), Purple, 8-Ounce Bottle

**Brand:** tsi supercool
**Price:** R727
**Availability:** ✅ In Stock

## Summary

> 🕵️‍♂️ Spot leaks before they spot you!

## Quick Answers

- **What is this?** RD8 Radiator Coolant Water Based U/V Leak Detection Dye (Self Measure Bottle), Purple, 8-Ounce Bottle by tsi supercool
- **How much does it cost?** R727 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/36519329-rd8-radiator-coolant-water-based-u-v-leak-detection-dye)

## Best For

- tsi supercool enthusiasts

## Why This Product

- Trusted tsi supercool brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Cost & Time Saver:** Speeds up diagnostics, saving money on repairs
- • **Trusted Performance:** Top-rated with 4.6 stars and #10 in leak detection tools
- • **Effortless Application:** Self-measure bottle ensures perfect 1-ounce dosing per vehicle
- • **Precision Leak Detection:** Synthetic U/V dye reveals hidden coolant leaks fast
- • **Universal UV Compatibility:** Detect leaks with any standard UV light source

## Overview

TSI Supercool RD8 is a purple, synthetic UV leak detection dye in an 8-ounce self-measure bottle, designed to quickly and accurately identify coolant leaks in water-cooled engines using any UV light. Trusted by professionals and DIYers alike, it simplifies leak diagnostics, saving time and repair costs.

## Description

TSI Supercool RD8 Radiator Dye - 8-Ounce - Self Measure Bottle is a Synthetic U/V Leak Detection Dye that is engineered to quickly find system leaks. It is detectable with any U/V light. It is conveniently designed for easy measuring, use 1-Ounce per vehicle.

Review: Great results - This stuff worked great, one ounce was more than enough. For those who said the product didn’t fluoresce in the bottle, I believe it needs to mix with the coolant/water to really light up. Remember this is to be used with a black light/UV light to see the leak. While it was bright enough to see some areas with no artificial UV light, it is ideally used with a UV light. Super bright for me, showed the leak clearly and was in an area that I never would have thought of or found without the leak detector.
Review: Worked great, fast leak detection - I had a coolant leak. My mechanic said that they couldn't determine where the leak was because it was very slow. After a while, the rate of leaking increased. Rather than using a leak-seal product, I wanted a real fix, so I added this dye and drove around. My mechanic said that the dye made it very easy to see where the leak was. This saved a considerable amount of diagnostic time... and saved me a considerable money. It was really easy to use. The only issue was that my mechanic said that the dye had made a mess on the bottom side of my truck.

## Features

- Includes Synthetic U/V Leak Detection Dye
- Offers to Quickly Find Cooling System Leaks
- Features a Formula that is Detectable with any U/V Light
- Use 1-Ounce Per Vehicle
- U/V Leak Detection Dye used to detect leaks in water cooled engines

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B008PKWEHY |
| Best Sellers Rank | #3,828 in Automotive ( See Top 100 in Automotive ) #10 in Air Conditioning Leak Detection Tools |
| Brand Name | TSI Supercool |
| Color | Purple |
| Compatible Material | Metal |
| Customer Reviews | 4.6 4.6 out of 5 stars (476) |
| Global Trade Identification Number | 00672264001743 |
| Included Components | TSI Supercool RD8 Radiator Dye, 8 oz (Self Measure Bottle) |
| Item Form | Liquid |
| Item Type Name | TSI Supercool RD8 Radiator Dye, 8 oz (Self Measure Bottle) |
| Item Weight | 9.6 ounces |
| Manufacturer | TSI Supercool |
| Manufacturer Part Number | RD8 |
| Model Number | RD8 |
| Number of Items | 1 |
| UPC | 672264001743 |
| Unit Count | 1.0 Count |
| Warranty Description | manufacturer warranty |

## Product Details

- **Brand:** TSI Supercool
- **Color:** Purple
- **Compatible Material:** Metal
- **Item Form:** Liquid
- **Item Weight:** 9.6 ounces

## Images

![RD8 Radiator Coolant Water Based U/V Leak Detection Dye (Self Measure Bottle), Purple, 8-Ounce Bottle - Image 1](https://m.media-amazon.com/images/I/51lTSxJELpL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great results
*by T***I on January 15, 2026*

This stuff worked great, one ounce was more than enough. For those who said the product didn’t fluoresce in the bottle, I believe it needs to mix with the coolant/water to really light up. Remember this is to be used with a black light/UV light to see the leak. While it was bright enough to see some areas with no artificial UV light, it is ideally used with a UV light. Super bright for me, showed the leak clearly and was in an area that I never would have thought of or found without the leak detector.

### ⭐⭐⭐⭐⭐ Worked great, fast leak detection
*by B***K on February 1, 2026*

I had a coolant leak. My mechanic said that they couldn't determine where the leak was because it was very slow. After a while, the rate of leaking increased. Rather than using a leak-seal product, I wanted a real fix, so I added this dye and drove around. My mechanic said that the dye made it very easy to see where the leak was. This saved a considerable amount of diagnostic time... and saved me a considerable money. It was really easy to use. The only issue was that my mechanic said that the dye had made a mess on the bottom side of my truck.

### ⭐⭐⭐⭐⭐ works fantastic - with caution
*by M***L on March 3, 2026*

works fantastic with a UV light - not dim illumination under light, very bright You could realistically use half the volume they recommend. --note of caution-- it WILL fluoresce brightly in trace amounts, you will have to clean very thoroughly if you're continuously chasing leaks or using it as early detection.

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.co.za/products/36519329-rd8-radiator-coolant-water-based-u-v-leak-detection-dye](https://www.desertcart.co.za/products/36519329-rd8-radiator-coolant-water-based-u-v-leak-detection-dye)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-04-24*