---
product_id: 527544813
title: "Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb"
brand: "uptthow"
price: "€ 99.14"
currency: EUR
in_stock: true
reviews_count: 13
category: "Uptthow"
url: https://www.desertcart.hr/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb
store_origin: HR
region: Croatia
---

# Waterproof & impermeable cement mix 19mm fiber length for optimal reinforcement Enhanced impact & seismic resistance Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb

**Brand:** uptthow
**Price:** € 99.14
**Availability:** ✅ In Stock

## Summary

> 🧱 Reinforce your concrete game — stronger, smarter, unbreakable!

## Quick Answers

- **What is this?** Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb by uptthow
- **How much does it cost?** € 99.14 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb)

## Best For

- uptthow enthusiasts

## Why This Product

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

## Key Features

- • **Easy Pro Mix Formula:** Simply blend fiberglass with sand and cement, then stir 30-60 seconds longer for superior bonding.
- • **Crack-Defying Toughness:** Fiberglass fibers disperse irregularly to prevent fine cracks and boost mortar durability.
- • **Impact & Seismic Shield:** High-strength filaments form a tight net, dramatically improving impact resistance and structural integrity.
- • **Waterproof Barrier Boost:** Dense fiber network seals cement, perfect for wet environments like basements and exterior walls.
- • **Precision Dosage for Peak Performance:** Use 1 lb per cubic yard, with extra for high-impact or freeze-thaw zones to maximize protection.

## Overview

UPTTHOW's 19mm fiberglass reinforcement (4lb pack) integrates seamlessly into cement mortar, enhancing toughness by preventing cracks, boosting waterproofing, and increasing impact and seismic resistance. Ideal for residential and wet-area applications, it’s a must-have upgrade for durable, long-lasting concrete projects.

## Description

Please note that 4lb are packed in one bag

Review: Home Concrete Slab With Fiberglass - I added this fiberglass to my concrete mix for a slab that was 3’W x 17’L x 4”D and it worked perfectly and made it super durable….
Review: Perfect addition to Bondo or fiberglass resin. - Perfect for adding to Bondo for extra strength. As a taxidermist, I add it to Bondo to make thinner ears in the animals that I taxidermy. It does a great job.

## Features

- Anti-cracking: Mixing fiberglass and mortar together, the irregular distribution of fiberglass in the mortar enhances the toughness of mortar, and inhibits the formation of fine cracks
- Waterproof and Impermeable: A large number of fiber filaments increase the density of cement, which can effectively solve the problem of penetration. It is very suitable for wet place such as basements, pond, Exterior wall
- Impact Resistance: High-strength fiber filaments are attached to each other as a dense net to hold the cement tightly. It can effectively enhance the impact and seismic performance of cement
- How to Use: Evenly mix sand, cement and fiberglass together, then add an appropriate amount of water, and finally stir (the stiring time is 30-60 seconds longer than without fiberglass)
- Dosage: Use 1 lb. (1 pkg) per cubic yard (27 cubic feet) of concrete. You can add a little more in the area with strong impact or severe freeze-thaw

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BX8P982L |
| Best Sellers Rank | #49,222 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Mortar Mix |
| Brand | UPTTHOW |
| Brand Name | UPTTHOW |
| Color | White |
| Customer Reviews | 4.7 out of 5 stars 384 Reviews |
| Grade Rating | Residential |
| Item Diameter | 0.75 inches |
| Item Form | Fiber |
| Item Shape | Honeycomb |
| Manufacturer | UPTTHOW |
| Material | fiberglass |
| Model Number | JIN-Fiberglass 19mm-4lb |
| Number of Items | 4 |
| Part Number | JIN-Fiberglass 19mm-4lb |
| Shape | Honeycomb |
| Unit Count | 4 Count |

## Product Details

- **Brand:** UPTTHOW
- **Color:** White
- **Item Diameter:** 0.75 Inches
- **Material:** fiberglass
- **Shape:** Honeycomb

## Images

![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 1](https://m.media-amazon.com/images/I/715nRghGIDL.jpg)
![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 2](https://m.media-amazon.com/images/I/81XOIowNKOL.jpg)
![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 3](https://m.media-amazon.com/images/I/81eubYW9sXL.jpg)
![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 4](https://m.media-amazon.com/images/I/81HCtLzu8UL.jpg)
![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 5](https://m.media-amazon.com/images/I/91vaUr-2FKL.jpg)

## Available Options

This product comes in different **Size, Item Package Quantity** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Home Concrete Slab With Fiberglass
*by R***E on July 13, 2026*

I added this fiberglass to my concrete mix for a slab that was 3’W x 17’L x 4”D and it worked perfectly and made it super durable….

### ⭐⭐⭐⭐⭐ Perfect addition to Bondo or fiberglass resin.
*by S***V on October 18, 2025*

Perfect for adding to Bondo for extra strength. As a taxidermist, I add it to Bondo to make thinner ears in the animals that I taxidermy. It does a great job.

### ⭐⭐⭐⭐⭐ Great for the price
*by R***V on August 3, 2026*

I really haven't used the product yet But it seems to be a good looking product and weight

## Frequently Bought Together

- UPTTHOW Fiberglass for Cement Mortar Concrete Reinforcement Anti-seepage and Anti-cracking Cement Mix for Building Walls Garden Floor 3/4"(19MM)-1lb/PACK
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- SIKA - SikaLatex R - Concrete Adhesive Glue, White - Admix for Portland-Cement Mortar/Concrete - Resistant to Freezing and thawing Damage - 1-Gallon

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**Shop now:** [https://www.desertcart.hr/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb](https://www.desertcart.hr/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-12*