---
product_id: 14093110
title: "Hardcast 304132 Flex-Grip 550 Water Based Duct Sealant - 1 Gallon"
brand: "hardcast"
price: "R2465"
currency: ZAR
in_stock: true
reviews_count: 1
category: "Hardcast"
url: https://www.desertcart.co.za/products/14093110-hardcast-304132-flex-grip-550-water-based-duct-sealant-1
store_origin: ZA
region: South Africa
---

# Fast, easy application for professional results Water-based formula for eco-friendly sealing Compatible with fiberglass, metal & plastic Hardcast 304132 Flex-Grip 550 Water Based Duct Sealant - 1 Gallon

**Brand:** hardcast
**Price:** R2465
**Availability:** ✅ In Stock

## Summary

> 💼 Seal smart, work sharp — the pro’s choice for duct perfection!

## Quick Answers

- **What is this?** Hardcast 304132 Flex-Grip 550 Water Based Duct Sealant - 1 Gallon by hardcast
- **How much does it cost?** R2465 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/14093110-hardcast-304132-flex-grip-550-water-based-duct-sealant-1)

## Best For

- hardcast enthusiasts

## Why This Product

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

## Key Features

- • **Effortless application:** Smooth, spreadable texture that saves time on every job
- • **Durable water resistance:** Reliable protection against moisture for long-lasting duct integrity
- • **Eco-smart water-based sealant:** Safe, low-odor, and environmentally conscious for modern workspaces
- • **Trusted pro-grade performance:** Highly rated by users who demand quality and efficiency
- • **Universal material compatibility:** Seals fiberglass, metal, and plastic ducts seamlessly

## Overview

Hardcast 304132 Flex-Grip 550 is a 1-gallon, gray, water-based duct sealant designed for easy, durable sealing of fiberglass, metal, and plastic ducts. Lightweight and eco-friendly, it offers water resistance and smooth application, making it a top-rated solution for HVAC professionals seeking reliable, efficient duct sealing.

## Description

The item is FLEX-GRIP 550 WATER BASED DUCT - HARDCAST 304132, SEALANT 1-GAL PAIL GRAY with UPC: 638532800050. FLEX-GRIP 550 WATER BASED DUCT is manufactured by: HARDCAST. FLEX-GRIP 550 WATER BASED DUCT is a component that has the part number of: 304132. And weighs at around 12.00 lbs.

Review: Great material and very easy to work with - Very easy to use when sealing duct board seams, especially when using in conjunction with hardcast foil tape.

## Features

- HARDCAST 304132 FLEXGRIP 550 WATER BASED DUCT SEALANT 1GAL PAIL GRAY

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003PL7UK4 |
| Best Sellers Rank | #337,603 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #948 in Hardware Sealers |
| Brand | Hardcast |
| Brand Name | Hardcast |
| Color | gray |
| Compatible Material | Fiberglass, Metal, Plastic |
| Customer Reviews | 5.0 out of 5 stars 2 Reviews |
| Item Form | Liquid |
| Item Weight | 7.5 Pounds |
| Manufacturer | Hardcast |
| Material | Hardcast |
| Material Type | Hardcast |
| Number of Items | 1 |
| Part Number | 304132 |
| Style | Compact |
| Style Name | Compact |
| Surface Recommendation | [Multiple] |
| UPC | 063853280005 |
| Unit Count | 1 Count |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Hardcast
- **Item Weight:** 7.5 Pounds
- **Material:** Hardcast
- **Style:** Compact
- **Water Resistance Level:** Water Resistant

## Images

![Hardcast 304132 Flex-Grip 550 Water Based Duct Sealant - 1 Gallon - Image 1](https://m.media-amazon.com/images/I/31n7jdXswvL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great material and very easy to work with
*by M***O on May 5, 2026*

Very easy to use when sealing duct board seams, especially when using in conjunction with hardcast foil tape.

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**Shop now:** [https://www.desertcart.co.za/products/14093110-hardcast-304132-flex-grip-550-water-based-duct-sealant-1](https://www.desertcart.co.za/products/14093110-hardcast-304132-flex-grip-550-water-based-duct-sealant-1)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-07-15*