---
product_id: 47578533
title: "Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios."
brand: "blue star"
price: "222 Lei"
currency: RON
in_stock: true
reviews_count: 11
category: "Blue Star"
url: https://www.desertcart.ro/products/47578533-bluestar-flexible-concrete-hairline-crack-filler-light-gray-diy-no
store_origin: RO
region: Romania
---

# Micron-sized precision filler Flexible in extreme temps DIY, no special tools Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios.

**Brand:** blue star
**Price:** 222 Lei
**Availability:** ✅ In Stock

## Summary

> 🧱 Seal the deal with style—flexible crack repair made effortless!

## Quick Answers

- **What is this?** Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios. by blue star
- **How much does it cost?** 222 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/47578533-bluestar-flexible-concrete-hairline-crack-filler-light-gray-diy-no)

## Best For

- blue star enthusiasts

## Why This Product

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

## Key Features

- • **Dual Gray Shades:** Choose Light Gray or Gray to perfectly match your concrete
- • **Proudly Made in the USA:** Quality you can trust, supporting local craftsmanship
- • **Effortless DIY Application:** No special tools needed—get professional results in minutes
- • **Weather-Resilient Flexibility:** Stays flexible through hot summers and freezing winters—no more re-cracks
- • **Precision Micron-Sized Formula:** Seamlessly fills hairline cracks for a flawless finish

## Overview

Bluestar Flexible Concrete Hairline Crack Filler is a 7 fl. oz. synthetic rubber sealant designed for easy DIY repair of small cracks in concrete surfaces. Available in two gray shades, it features a micron-sized formula that fills hairline cracks precisely and remains flexible in extreme temperatures, ensuring long-lasting durability. Made in the USA, this water-resistant filler requires no special tools and is ideal for driveways, sidewalks, and patios.

## Description

Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios.

Review: Easy to use, and works great! - I used this to close up some openings on my screened porch, to keep insects out. It is very easy to use, and very effective. Once applied, it retains some flexibility, so no cracking when the temperature changes. Highly recommend.
Review: Best product - Their are occasions where you encounter a product where you feel compelled to provide a product review, good or bad. This is one of those products. This product is perfect as described. Those that have provided negative comments either do not understand the product or have an application not suited for this product. It is easy to apply, does just as the description says and is very easy to use. The description says for small cracks. Understand that —small cracks. I highly recommend this product if your need fits the provided description.

## Features

- MICRON SIZED TO FILL HAIRLINE CRACKS
- TWO SHADES OF GRAY TO CHOOSE FROM - GRAY & LIGHT GRAY
- FORMULATED TO REMAIN FLEXIBLE IN HOT & COLD WEATHER
- DIY - Fast & Easy to Apply
- 7 Fl. Oz. MADE IN THE U.S.A.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B073ZL6GXN |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #199,368 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #484 in Wall Surface Repair Products |
| Brand | Blue Star |
| Capacity Description | 8 |
| Color | Light Gray |
| Customer Reviews | 4.2 4.2 out of 5 stars (931) |
| Date First Available | July 17, 2017 |
| Included Components | Sealant |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Weight | 8 ounces |
| Item dimensions L x W x H | 3 x 3 x 8 inches |
| Item model number | HL90LG-1 |
| Manufacturer | Bluestar |
| Material | Synthetic Rubber |
| Number of Items | 1 |
| Part Number | MM-92-1 |
| Product Dimensions | 3 x 3 x 8 inches |
| Style | Compact |
| Surface Recommendation | Floor |
| UPC | 866019000154 |
| Unit Count | 16.0 Ounce |
| Usage | Concrete/Masonry |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Blue Star
- **Item Weight:** 8 Ounces
- **Item dimensions L x W x H:** 3 x 3 x 8 inches
- **Material:** Synthetic Rubber
- **Style:** Compact

## Images

![Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios. - Image 1](https://m.media-amazon.com/images/I/319UpGle4TL.jpg)
![Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios. - Image 2](https://m.media-amazon.com/images/I/51L4rGTfKiL.jpg)
![Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios. - Image 3](https://m.media-amazon.com/images/I/61Q2rOb+4GL.jpg)
![Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios. - Image 4](https://m.media-amazon.com/images/I/718opsTgD2L.jpg)
![Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios. - Image 5](https://m.media-amazon.com/images/I/71zjbNoQ-TL.jpg)

## Questions & Answers

**Q: Approximately how many linear feet can i expect from one bottle?**
A: Sir, There is no easy way to calculate the lineal feet of crack coverage.  other than guesstimating the the volume.  It really depends on the depth and width of your crack and Length.  However,  proper preparation of the crack is essential.  I plan on sandblasting my cracks, cleaning them out by using high pressure air or water. and then filling the void with the sealant.  If you use a pressure washer you need to make sure it is allowed to dry thoroughly before putting the sealant with them.  Filling the cracks on a warm day is a must.  Timing helps. Good luck. Michael

**Q: Can this be cleaned up with water while using?  Like using a wet sponge**
A: Yes.  Water clean up can be used.

**Q: I have a 2 tiered water fountain and the second tiered has hairline crack, can this product prevent it from breaking apart?**
A: This product will seal the crack but it will not repair it.  However our Bluestar Concrete Resurfacer may repair it since it is a concrete with added polymer for strength.   Bluestar Concrete Resurfacer is sold on Amazon also.

**Q: Will this work on tile?**
A: Yes. I’ve found it works on concrete, tile, stone and even wood. Great product.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy to use, and works great!
*by A***R on August 2, 2024*

I used this to close up some openings on my screened porch, to keep insects out. It is very easy to use, and very effective. Once applied, it retains some flexibility, so no cracking when the temperature changes. Highly recommend.

### ⭐⭐⭐⭐⭐ Best product
*by B***B on August 1, 2023*

Their are occasions where you encounter a product where you feel compelled to provide a product review, good or bad. This is one of those products. This product is perfect as described. Those that have provided negative comments either do not understand the product or have an application not suited for this product. It is easy to apply, does just as the description says and is very easy to use. The description says for small cracks. Understand that —small cracks. I highly recommend this product if your need fits the provided description.

### ⭐⭐⭐⭐ Good to fill narrow concrete cracks
*by D***A on May 17, 2025*

A good product, I needed to fill ~1/16 inch crack in New concrete floor. Performed as advertized but required 2 applications to fill crack.

## Frequently Bought Together

- Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios.
- Bluestar Flexible Concrete Hairline Crack Filler (Gray), DIY - No Special Tools Needed. Fill Cracks in Driveways - Patios - Sidewalks. 8 fl. oz. Bottle.
- DAP 37584 Liquid Cement Crack Filler, 1 quart, Gray

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ro/products/47578533-bluestar-flexible-concrete-hairline-crack-filler-light-gray-diy-no](https://www.desertcart.ro/products/47578533-bluestar-flexible-concrete-hairline-crack-filler-light-gray-diy-no)

---

*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-03*