---
product_id: 46259170
title: "RT400P Viper Wetrag Heat Blocking Putty Jar (1), 12 oz."
brand: "refrigeration technologies"
price: "$99.75"
currency: USD
in_stock: true
reviews_count: 8
category: "Refrigeration Technologies"
url: https://www.desertcart.ec/products/46259170-rt400p-viper-wetrag-heat-blocking-putty-jar-1-12-oz
store_origin: EC
region: Ecuador
---

# No mess, water-activated formula Blocks direct & conductive heat Reusable up to 40 times RT400P Viper Wetrag Heat Blocking Putty Jar (1), 12 oz.

**Brand:** refrigeration technologies
**Price:** $99.75
**Availability:** ✅ In Stock

## Summary

> 🔥 Mold. Protect. Repeat. Stay cool under pressure.

## Quick Answers

- **What is this?** RT400P Viper Wetrag Heat Blocking Putty Jar (1), 12 oz. by refrigeration technologies
- **How much does it cost?** $99.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/46259170-rt400p-viper-wetrag-heat-blocking-putty-jar-1-12-oz)

## Best For

- refrigeration technologies enthusiasts

## Why This Product

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

## Key Features

- • **Compact & Portable:** 12 oz jar fits easily in your toolkit, ready to deploy whenever precision heat protection is critical.
- • **Reusable Efficiency:** Use up to 40 times—just re-moisten and mold for consistent, eco-friendly protection.
- • **Mess-Free Application:** No drips or spills with a clean, water-activated putty formula that molds perfectly to any surface.
- • **Ultimate Heat Shielding:** Protect sensitive valves and surfaces from extreme heat damage during brazing or welding.
- • **Versatile Torch Compatibility:** Works seamlessly with MAP/PRO, oxy/acetylene, MIG, TIG, arc, and propane torches for all your repair needs.

## Overview

The Refrigeration Technologies RT400P Viper Wet Rag Heat Blocking Putty is a high-viscosity, reusable putty designed to protect sensitive components from direct and conductive heat during welding, brazing, or soldering. Its no-mess, water-activated formula molds easily to surfaces, providing up to 40 uses per 12 oz jar. Compatible with multiple torch types, it’s an essential heat shield for professional repairs and maintenance.

## Description

Viper wet rag heat blocking putty is a reusable heat blocking putty that keeps piping and sensitive components cooler than a traditional wet rag during brazing, soldering or welding. Simply mold putty in front of area that needs to be protected from heat. Braze, solder or weld. Let heated areas cool. Remove putty and place back into jar. Re moisten with a few drops of water if putty becomes dry. Good for up to 40 uses. Features: Reusable protects surfaces, valves and other sensitive parts from heat damage blocks direct and conductive heat transfer no mess formula use with map/pro, oxy/acetylene, mig, tig, arc and propane torches non toxic.

Review: Best I have found - Fantastic stuff!
Review: Did the job - Holds water, molds well to an eccentric surface, and keeps refrigerant valves cooler during brazing. Worked well on the liquid line repair job that I bought it for. Would recommend and use in conjunction with a wet rag to get the best cooling.

## Features

- It is reusable
- Protects surfaces, valves
- Blocks direct and conductive heat transfer
- No mess formula

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B017T23T18 |
| Brand | Refrigeration Technologies |
| Color | Gray |
| Date First Available | December 22, 2015 |
| Global Trade Identification Number | 00017857400082 |
| Is Discontinued By Manufacturer | No |
| Item Form | Putty |
| Item Package Quantity | 1 |
| Item Volume | 12 Fluid Ounces |
| Item Weight | 1.6 ounces |
| Item model number | RT400P |
| Manufacturer | Refrigeration Technologies |
| Number of Pieces | 1 |
| Package Information | Jar |
| Product Dimensions | 0.1 x 0.1 x 0.1 inches |
| Special Feature | Heat Resistant |
| Specific Uses For Product | Repair, Welding |
| UPC | 696335182315 017857400082 |
| Unit Count | 12.0 Ounce |
| Viscosity | High Viscosity |
| Viscosity Level | High |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Refrigeration Technologies
- **Color:** Gray
- **Item Form:** Putty
- **Special Feature:** Heat Resistant
- **Specific Uses For Product:** Repair, Welding

## Images

![RT400P Viper Wetrag Heat Blocking Putty Jar (1), 12 oz. - Image 1](https://m.media-amazon.com/images/I/61SVbN76qCL.jpg)

## Questions & Answers

**Q: How long does this last or how many times can it be exposed to high heat?**
A: As long as you put back in the jar and seal it. it lasts  a very long time its been a year and it still works. braze all the time never had a problem its been exposed to high heat for at least 15mins still kept protected area intact.

**Q: Does this leave residue or react with metal?**
A: No. Just clean off any residual COMPLETELY>

**Q: why is this is 20 dollars on ebay?**
A: Can't answer that, but the ease of Amazon returns is worth purchasing some products at a higher price from them.
I used this product to solder fittings near a TXV valve and it worked great.

**Q: Is it conductive? can it be used to shield parts on a pcb while using a heat gun?**
A: This is a paste type product.  It leaves residue.  Idk if its appropriate for a pcb.  We use it to protect vulnerable parts when arc welding or torch cutting.  It should be capable of protecting from a heat gun.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best I have found
*by E***C on November 23, 2025*

Fantastic stuff!

### ⭐⭐⭐⭐⭐ Did the job
*by D***L on January 19, 2026*

Holds water, molds well to an eccentric surface, and keeps refrigerant valves cooler during brazing. Worked well on the liquid line repair job that I bought it for. Would recommend and use in conjunction with a wet rag to get the best cooling.

### ⭐⭐⭐⭐⭐ DIY AC Job
*by D***D on July 31, 2023*

With the crazy economy we find ourselves, my son and I ended up doing our own AC repair. We replaced our A-Coil and outside condenser unit with all the filters, fittings, etc. We also decided to use the solder with flux method as opposed to the silver rod brazing method. We were successful just before the hot muggy weather overtook our part of the country. We used this product to manage the heat transfer and avoid damaging other components in our high pressure line and liquid line. It worked well and was easy to apply and remove.

## Frequently Bought Together

- Refrigeration Technologies RT400P Viper Wetrag Heat Blocking Putty Jar (1), 12 oz.
- Matace 2 Pack 12x14 Inch Fireproof Welding Blanket & Pad, 5mm Thickened Fire Resistant Carbon Felt Cloth, Flame Retardant Fabric for Stove Wick, Heat Shield for Soldering, Firepit, Smoker, Black
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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-03*