---
product_id: 20878581
title: "3M Bondo Short Strand Fiberglass Reinforced Filler 1.37 LB (621 g) with Bondo Cream Hardener 0.5 oz (14g), Repair Holes Up To 0.5 IN, Waterproof (SS-PT-ES)"
brand: "bondo"
price: "211 Lei"
currency: RON
in_stock: true
reviews_count: 8
category: "Bondo"
url: https://www.desertcart.ro/products/20878581-3m-bondo-short-strand-fiberglass-reinforced-filler-1-37-lb
store_origin: RO
region: Romania
---

# Waterproof & paint compatible Sands in 20 mins 2x stronger fiberglass strands 3M Bondo Short Strand Fiberglass Reinforced Filler 1.37 LB (621 g) with Bondo Cream Hardener 0.5 oz (14g), Repair Holes Up To 0.5 IN, Waterproof (SS-PT-ES)

**Brand:** bondo
**Price:** 211 Lei
**Availability:** ✅ In Stock

## Summary

> 🛠️ Fix it right, fix it strong — the pro’s choice for flawless, fast repairs!

## Quick Answers

- **What is this?** 3M Bondo Short Strand Fiberglass Reinforced Filler 1.37 LB (621 g) with Bondo Cream Hardener 0.5 oz (14g), Repair Holes Up To 0.5 IN, Waterproof (SS-PT-ES) by bondo
- **How much does it cost?** 211 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/20878581-3m-bondo-short-strand-fiberglass-reinforced-filler-1-37-lb)

## Best For

- bondo enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Repair Workflow:** Fast curing and sanding in as little as 20 minutes means less downtime and quicker project completion.
- • **Precision Hole Coverage:** Seamlessly fills holes up to 0.5 inches without backing strips or cloth, streamlining your repair process.
- • **Unmatched Structural Strength:** Fiberglass reinforcement delivers double the durability of standard fillers, making repairs as solid as new metal.
- • **Professional-Grade Reliability:** Trusted by industry pros for rust-out and dent repairs on cars, boats, and more — waterproof and built to last.
- • **Versatile Finish Compatibility:** Works flawlessly under most paints and pairs perfectly with body filler and glaze for a flawless finish.

## Overview

3M Bondo Short Strand Fiberglass Reinforced Filler is a professional-grade, waterproof body filler designed for small hole and rust-out repairs up to 0.5 inches. Featuring interlocking fiberglass strands, it offers twice the strength of regular fillers and sands smooth in just 20 minutes. Compatible with most paints and ideal for automotive and marine applications, it provides a durable, paint-ready foundation without the need for backing materials.

## Description

Bondo Glass Reinforced Filler makes an excellent foundation for hole, dent and rust-out repairs without the need for backing strips, cloths and resins. It contains short, interlocking fiberglass strands and fibers that make it twice as strong as regular body filler. It is also slightly thicker and provides a fast drying time, making the filler less messy on vertical surfaces like car doors.

Review: Let me save you some time... Read before you buy!! - EXTREMELY IMPORTANT DISCLAIMER AT THE BOTTOM‼️‼️ Here's review though, specifically for auto repairs, but also some general bondo advice. I used 3M Bondo Short Strand Fiberglass Reinforced Filler to fix a large rust spot on my car, and let me tell you, if you do it right, this stuff is ridiculously strong. Once it’s cured, it’s as solid as, if not stronger than, the original sheet metal. My goal was to create a structurally sound, paintable surface after getting rid of the rust, and this filler absolutely delivered. But here’s the deal: if you don’t mix it right, you’re in for a frustrating time. Let me save you some trouble. Step 1: The Strength is No Joke Once this sets, it’s like welding new metal onto your car. It doesn’t crack, doesn’t shrink, and it bonds extremely well. I was working in cold weather, and it still dried in 15-30 minutes, ready to sand. That’s impressive, considering most fillers struggle in lower temps. If you’re patching a rust hole like I was, get rid of ALL the weak metal (smack with hammer, sand, and again, sand some more). This filler is strong, but it’s not magic, if you slap it on top of rust, the problem will come back. Prep and treat the rust surface properly, and this stuff will hold like a champ. (I used POR-15 and a rubberized undercoating, which I also have under reviewed under my profile if you want the best of the best like I did lol. Cheaper spray rust neutralizers and preventers are available though, you don't need this necessarily.) Step 2: The Hardener Ratio is Where Most People Mess Up This is the part you NEED to get right. The included cream hardener is a little stingy for the amount of filler in the can, and if you don’t use the right amount, things get annoying fast: • Too little? It takes forever to cure, and you’ll be stuck waiting hours instead of minutes. • Too much? It’ll set before you can spread it properly, and you’ll be fighting against a rock-hard mess. This is really bad if you put it on whatever you're working on but can't work with it and it's stuck on your surface. Here’s What Actually Works: • Use slightly more hardener than the directions say. Not a crazy amount, just a small increase. • Mix FAST until the color is completely uniform. No streaks, no swirls, just one consistent shade. • Once mixed, IMMEDIATELY spread it out into a thin layer on your mixing surface (I used cardboard). Why? It cures through an exothermic reaction, basically, heat makes it set. If you leave it in a thick pile, it heats up too quickly and hardens before you can work with it. By spreading it thin, it cures more evenly and gives you time to apply it. (Even if you're not using this for cars, this is still a good practice with any fillers). Step 3: Sanding & Making It Paint-Ready After curing, this filler sands beautifully, assuming you applied it evenly. If you messed up the mix, you’ll either have rock-hard clumps or a weird gummy texture that won’t sand properly. Get the ratio right, and it smooths out great. That said, this is a structural filler, so don’t expect a perfectly smooth surface right away. To get it paint-ready, you’ll need: ✅ A lightweight filler – This smooths out any imperfections and evens out the surface. ✅ Spot putty – This is the finishing touch for getting it perfectly smooth and one last high grit sand paper sand, before priming and painting. I actually reviewed the lightweight filler and spot putty I used, and they worked perfectly as the top layer on top of the strong foundation this fiberglass filler provided. (again under my profile if you want liked my result and want what I used) If you’re doing bodywork, this combo is the way to go, fiberglass for strength, lightweight filler for smoothness, and spot putty for perfection. What I’d Change? Just Give Us More Hardener. Seriously, for the amount of filler in the can, they should include more cream hardener. If you don’t ration it right, you’ll run out before using all the filler, which is annoying. Just something to be aware of. Honestly just buy yourself a tube of cream hardener, unless you think you're only going to use a little bit of bondo. Final Verdict: Absolutely Worth It- If You Follow These Steps! You be the judge though, I've never done anything like this project, just have some good knowledge and have used bondo before. I think it turned out okay! • Strength: 10/10 – Feels like actual metal when cured. • Drying Time: 9/10 – Fast, even in cold weather. • Ease of Use: 7/10 – There’s a learning curve with the hardener ratio. • Paint Prep: 8/10 – Needs lightweight filler and spot putty for a flawless finish. • Value: 8/10 – Great, but they should include more hardener. If you’re fixing rust, follow these steps, and this filler will hold up like a champ. If you wing it, you’re gonna have a bad time. Save yourself the hassle and get the mix right from the start, as well as everything else you'll need for a repair like this! I reviewed everything else I used because I spent way too long researching everything I would need, and didn't find many reviews that gave me assurance or helpful info about each, I was kind of on my own. I'm still working on the reviews, but pretty soon they'll all be there if you click on my account. ‼️DISCLAIMER: This stuff releases an ungodly amount of fumes for a LONG time. If you are working in an indoor area, even with decent ventilation, you absolutely NEED to wear a respirator. I know I hyped this stuff up, but you can seriously damage your body messing around with this stuff without the proper gear. Even if you are outside, it's still best practice to wear one. Since Bondo is applied in thicker coats, it can release 3-5x more VOC content (deadly fumes) than spray paint does, this is like serious stuff. Not only that it releases fumes for a LOT longer. Wear a respirator, no joke.‼️
Review: Works Great! - Bought this to repair some bad spots in our fiberglass front door. This stuff worked so well. The door was super easy to paint over when done. Highly recommend.

## Features

- Fiberglass strands and fibers make it twice as strong as regular body filler
- Covers small (up to ½”) holes without the need for backing strips, fiberglass resin or cloth
- Excellent as a foundation for hole, dent and rust-out repair
- Can be paired with body filler and glaze for complete repairs
- Sandable in as little as 20 minutes for quick repairs
- Compatible with most paints
- For industrial/occupational use only. Not for consumer sale or use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00PB3NTFO |
| Age Range Description | Adult |
| Best Sellers Rank | #3,040 in Automotive ( See Top 100 in Automotive ) #6 in Body Repair Putty |
| Brand | bondo |
| Brand Name | bondo |
| Color | White |
| Color Code | White |
| Container Type | Can |
| Coverage | Full |
| Customer Reviews | 4.6 out of 5 stars 1,542 Reviews |
| Finish Type | Matte |
| Global Trade Identification Number | 00051131002777, 50051131002772 |
| Included Components | Can |
| Is Waterproof | True |
| Item Form | Not Aplicable |
| Item Type Name | Filler |
| Item Volume | 0.5 Fluid Ounces |
| Item Weight | 1.2 Pounds |
| Manufacturer | 3M |
| Model Name | 00277 |
| Paint Type | Enamel |
| Size | 0.5 Ounce (Pack of 1) |
| Special Feature | IDEAL FOR SMALL HOLE REPAIR and rust-out repairs on cars and boats |
| Special Features | IDEAL FOR SMALL HOLE REPAIR and rust-out repairs on cars and boats |
| Specific Uses For Product | Body Fillers |
| Surface Recommendation | Miscellaneous |
| UPC | 051131002777 |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** bondo
- **Color:** White
- **Finish Type:** Matte
- **Item Form:** Not Aplicable
- **Item Volume:** 0.5 Fluid Ounces
- **Paint Type:** Enamel
- **Size:** 0.5 Ounce (Pack of 1)
- **Special Feature:** IDEAL FOR SMALL HOLE REPAIR and rust-out repairs on cars and boats
- **Specific Uses For Product:** Body Fillers
- **Surface Recommendation:** Miscellaneous

## Images

![3M Bondo Short Strand Fiberglass Reinforced Filler 1.37 LB (621 g) with Bondo Cream Hardener 0.5 oz (14g), Repair Holes Up To 0.5 IN, Waterproof (SS-PT-ES) - Image 1](https://m.media-amazon.com/images/I/71FPK9X+3ZL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Let me save you some time... Read before you buy!!
*by H***R on March 12, 2025*

EXTREMELY IMPORTANT DISCLAIMER AT THE BOTTOM‼️‼️ Here's review though, specifically for auto repairs, but also some general bondo advice. I used 3M Bondo Short Strand Fiberglass Reinforced Filler to fix a large rust spot on my car, and let me tell you, if you do it right, this stuff is ridiculously strong. Once it’s cured, it’s as solid as, if not stronger than, the original sheet metal. My goal was to create a structurally sound, paintable surface after getting rid of the rust, and this filler absolutely delivered. But here’s the deal: if you don’t mix it right, you’re in for a frustrating time. Let me save you some trouble. Step 1: The Strength is No Joke Once this sets, it’s like welding new metal onto your car. It doesn’t crack, doesn’t shrink, and it bonds extremely well. I was working in cold weather, and it still dried in 15-30 minutes, ready to sand. That’s impressive, considering most fillers struggle in lower temps. If you’re patching a rust hole like I was, get rid of ALL the weak metal (smack with hammer, sand, and again, sand some more). This filler is strong, but it’s not magic, if you slap it on top of rust, the problem will come back. Prep and treat the rust surface properly, and this stuff will hold like a champ. (I used POR-15 and a rubberized undercoating, which I also have under reviewed under my profile if you want the best of the best like I did lol. Cheaper spray rust neutralizers and preventers are available though, you don't need this necessarily.) Step 2: The Hardener Ratio is Where Most People Mess Up This is the part you NEED to get right. The included cream hardener is a little stingy for the amount of filler in the can, and if you don’t use the right amount, things get annoying fast: • Too little? It takes forever to cure, and you’ll be stuck waiting hours instead of minutes. • Too much? It’ll set before you can spread it properly, and you’ll be fighting against a rock-hard mess. This is really bad if you put it on whatever you're working on but can't work with it and it's stuck on your surface. Here’s What Actually Works: • Use slightly more hardener than the directions say. Not a crazy amount, just a small increase. • Mix FAST until the color is completely uniform. No streaks, no swirls, just one consistent shade. • Once mixed, IMMEDIATELY spread it out into a thin layer on your mixing surface (I used cardboard). Why? It cures through an exothermic reaction, basically, heat makes it set. If you leave it in a thick pile, it heats up too quickly and hardens before you can work with it. By spreading it thin, it cures more evenly and gives you time to apply it. (Even if you're not using this for cars, this is still a good practice with any fillers). Step 3: Sanding & Making It Paint-Ready After curing, this filler sands beautifully, assuming you applied it evenly. If you messed up the mix, you’ll either have rock-hard clumps or a weird gummy texture that won’t sand properly. Get the ratio right, and it smooths out great. That said, this is a structural filler, so don’t expect a perfectly smooth surface right away. To get it paint-ready, you’ll need: ✅ A lightweight filler – This smooths out any imperfections and evens out the surface. ✅ Spot putty – This is the finishing touch for getting it perfectly smooth and one last high grit sand paper sand, before priming and painting. I actually reviewed the lightweight filler and spot putty I used, and they worked perfectly as the top layer on top of the strong foundation this fiberglass filler provided. (again under my profile if you want liked my result and want what I used) If you’re doing bodywork, this combo is the way to go, fiberglass for strength, lightweight filler for smoothness, and spot putty for perfection. What I’d Change? Just Give Us More Hardener. Seriously, for the amount of filler in the can, they should include more cream hardener. If you don’t ration it right, you’ll run out before using all the filler, which is annoying. Just something to be aware of. Honestly just buy yourself a tube of cream hardener, unless you think you're only going to use a little bit of bondo. Final Verdict: Absolutely Worth It- If You Follow These Steps! You be the judge though, I've never done anything like this project, just have some good knowledge and have used bondo before. I think it turned out okay! • Strength: 10/10 – Feels like actual metal when cured. • Drying Time: 9/10 – Fast, even in cold weather. • Ease of Use: 7/10 – There’s a learning curve with the hardener ratio. • Paint Prep: 8/10 – Needs lightweight filler and spot putty for a flawless finish. • Value: 8/10 – Great, but they should include more hardener. If you’re fixing rust, follow these steps, and this filler will hold up like a champ. If you wing it, you’re gonna have a bad time. Save yourself the hassle and get the mix right from the start, as well as everything else you'll need for a repair like this! I reviewed everything else I used because I spent way too long researching everything I would need, and didn't find many reviews that gave me assurance or helpful info about each, I was kind of on my own. I'm still working on the reviews, but pretty soon they'll all be there if you click on my account. ‼️DISCLAIMER: This stuff releases an ungodly amount of fumes for a LONG time. If you are working in an indoor area, even with decent ventilation, you absolutely NEED to wear a respirator. I know I hyped this stuff up, but you can seriously damage your body messing around with this stuff without the proper gear. Even if you are outside, it's still best practice to wear one. Since Bondo is applied in thicker coats, it can release 3-5x more VOC content (deadly fumes) than spray paint does, this is like serious stuff. Not only that it releases fumes for a LOT longer. Wear a respirator, no joke.‼️

### ⭐⭐⭐⭐⭐ Works Great!
*by J***T on January 27, 2026*

Bought this to repair some bad spots in our fiberglass front door. This stuff worked so well. The door was super easy to paint over when done. Highly recommend.

### ⭐⭐⭐⭐⭐ Great product
*by D***H on January 20, 2026*

Great short strand filler very strong repairs. Sands like glass.

## Frequently Bought Together

- 3M Bondo Short Strand Fiberglass Reinforced Filler 21 oz (595.34 g) with Bondo Cream Hardener 0.5 oz (14g), Repair Holes Up To 0.5 IN, Waterproof (SS-PT-ES)
- Frienda Body Filler Spreaders Plastic Tools for Automotive Applying Putties Glazes Caulks and Paint(6 Pcs,3 Sizes)
- Bondo Body Filler, Original Formula for Fast, Easy Repair & Restoration of your Vehicle, 00261, Filler 14 oz and 0.5 oz Hardener, 1 Can, Salmon

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-03-01*