---
title: "Fiberglass Filler — $277K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/fiberglass-filler"
last_updated: "2026-08-10T23:51:07.994Z"
locale: en
meta:
description: "Niche score 56/100 · $277K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $277K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Fiberglass Filler — $277K/yr Amazon US Niche (2026) - Flapen"
---
# **fiberglass filler**
**Worth a look**
Shows low returns (0.3%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 50Growth 57Conversion 65Competition 29Returns 99Price range 83Avg price 95Brand share 38Review moat 68Quality gap 32
**Returns**
**Incredible****0.3%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$33.19**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$7.31–$60.46**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****762.8**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Good****5.8%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Good****+30.6%**
90-day search growth — must beat 0% to launch
**Market size**
**Good****$277K**
$277K/yr · 143K searches
**Brand share**
**Okay****82%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****68%**
top-5 click share — leaders hold, buyers still browse
According to Flapen's Amazon United States niche tracking, fiberglass filler is a $277K/yr Amazon United States market (143K searches/yr). The top 5 brands hold 82% of demand. Demand peaks in May. Verdict: Worth a look — 56/100.
Data updated Jul 8, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fiberglass filler market data**
- **Units sold / yr**
- **10K–13K**
- avg 750–1,000/product
- **Revenue / yr**
- **$332K–$415K**
- units × avg price
- **Conversion rate**
- **5.8%**
- **Avg BSR**
- **#47**
- **Page quality**
- **0%**
- **Prime**
- **80%**
- **Sponsored**
- **87%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **67 months**
- **Avg seller age**
- **172 days**
## **Competition & brand share**
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**10 **▲rising
**Sellers**
**86**
**Top-5 brand share**
**82%**
Top 20: 100%
**Top-5 click share**
**68%**
Top 20: 100%
**Open market**
**13%**
- bondo28% - 3M19% - J-B Weld14% - U.S. Chemical & Plastics12% - Evercoat9% - TotalBoat5% - Open — no brand owns it (4 brands, 13%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +30.6% search growth over the last 90 days.
3K2KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/us/automotive/fiberglass-filler/trend)
## **Top fiberglass filler search terms**
- **fiberglass filler**27K/yr+32.6%4.3% conv. - **fiberglass body filler**16K/yr+14.9%5.7% conv. - **bondo glass**12K/yr+30.4%6.6% conv. - **fiberglass bondo**12K/yr+53.2%7.4% conv. - **duraglass body filler**8K/yr+6.4%6.5% conv. - **short strand fiberglass filler**6K/yr+68.8%6.8% conv. - **duraglass**9K/yr-3.8%3.6% conv. - **bondo fiberglass**6K/yr+63.1%6.2% conv. - **kitty hair fiberglass filler**6K/yr+18.0%5.8% conv. - **fiberglass putty**5K/yr+51.3%2.2% conv. [**All search terms **](https://flapen.com/research/us/automotive/fiberglass-filler/search-terms)
## **Top fiberglass filler products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$28K20%$55K30%$83K40%$111K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 15 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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)**bondo**$15.03**4.6★1,659 rev](https://www.amazon.com/dp/B00PB3NTFO) [2**J-B Weld Quart - Fiberglass Short-Strained Filler**J-B Weld**$23.94**4.7★267 rev](https://www.amazon.com/dp/B0DQTDTNS2) [3**Bondo Bondo-Hair Long Strand Fiberglass Reinforced Filler 00762 1 Quart**3M**$16.25**4.6★1,147 rev](https://www.amazon.com/dp/B000CINDQ8) [4**Bondo Glass Short Strand Reinforced Fiberglass Filler Stage 2 2.56 Oz Filler and 1 Oz Cream Hardener**3M**$21.25**4.7★2,330 rev](https://www.amazon.com/dp/B000VKZ3JM) [5**Duraglas Fiberglass Filled Filler 1 Gallon**U.S. Chemical & Plastics**$60.46**4.7★813 rev](https://www.amazon.com/dp/B002I0MOY0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Evercoat Body Shop 105010 Pro-Grade Reinforced Filler Added Strength and Durability for Dents in Aluminum Fiberglass & More Easy Mix Hardener Included 13 Fl Oz.**EVERCOAT Body Shop**$16.84**51 rev1y ago](https://www.amazon.com/dp/B0DYPG77RB) [**J-B Weld Quart - Fiberglass Short-Strained Filler**J-B Weld**$23.94**267 rev1y ago](https://www.amazon.com/dp/B0DQTDTNS2) [**LAUCO Ultra Fiber Sandable Fiberglass Filler Bridges Holes Water Resistant Lightweight for Fiberglass Steel Plastics Base Color of Yellow-Green 3 Liters**LAUCO**$53.28**100 rev2y ago](https://www.amazon.com/dp/B0CLM9SWCN) [**Frienda 6 Pcs Body Filler Spreaders Plastic Tools for Automotive Applying Putties Glazes Caulks and Paint (3 Sizes)**Frienda**$7.31**1,507 rev3y ago](https://www.amazon.com/dp/B0BY8QZY5Z) [**TotalBoat Polyester Structural Repair Putty - Marine Grade Long Strand Fiber Fiberglass Reinforced Filler for Boat and Automotive Repair (Quart Kit)**TotalBoat**$40.23**869 rev8y ago](https://www.amazon.com/dp/B07C9D2GFJ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**FGCI Boatyard Polyester Laminating Resin 1 Quart Kit with MEKP Hardener Clear Fiberglass Resin for Boat Repair and Small Layup Projects Made in the USA**FGCI**$19.55**4.0★**▲ 201%**](https://www.amazon.com/dp/B006VY78QS) [**TotalBoat TotalFair Marine Epoxy Fairing Compound for Fiberglass Wood Aluminum and Steel (2 Pint Kit)**TotalBoat**$45.88**4.5★**▲ 62%**](https://www.amazon.com/dp/B00S9RBWIA) [**Bondo Glass Short Strand Reinforced Fiberglass Filler Stage 2 2.56 Oz Filler and 1 Oz Cream Hardener**3M**$21.25**4.7★**▲ 21%**](https://www.amazon.com/dp/B000VKZ3JM) [**LAUCO Ultra Fiber Sandable Fiberglass Filler Bridges Holes Water Resistant Lightweight for Fiberglass Steel Plastics Base Color of Yellow-Green 3 Liters**LAUCO**$53.28**4.7★**▲ 20%**](https://www.amazon.com/dp/B0CLM9SWCN) [**Bondo Bondo-Hair Long Strand Fiberglass Reinforced Filler 00762 1 Quart**3M**$16.25**4.6★**▲ 11%**](https://www.amazon.com/dp/B000CINDQ8)
**~~View all trending →~~**
## **What buyers say about fiberglass filler**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**26%
*“Great product as”*
**Efficiency**13%
*“Worked good for what I needed”*
**Ease Of Use**11%
*“This product is easy to use”*
**Value For Money**11%
*“great price”*
**Maintenance And Repair**9%
*“Good small kit for small repairs”*
**Advertised Vs Actual Product**6%
*“workes as advertised”*
**Durability**4%
*“Worked great and lasting not falling apart”*
**Water Resistance**3%
*“This is a good quality waterproof body filler with long strands of fiberglass strands to make it much stronger”*
**Assembly/Installation**2%
*“it will set up on you in just minutes”*
**Ease Of Cleaning**2%
*“didn't make to much of a mess”*
### **What buyers complain about **
**Flexibility**15%
*“Unfortunately, the one I received is hard as a rock with almost no flex at all”*
**Advertised Vs Actual Product**15%
*“Deceptive Ad & Non Returnable”*
**Hard Feel**12%
*“Hard as a rock”*
**Strength**8%
*“Very brittle”*
**Quality-Overall**5%
*“Complete Garbage”*
**Instructions/User Manual/Troubleshooting**4%
*“After reading detailed instructions determined wouldnt work for my project”*
**Color**4%
*“You'd think they would provide a off-color hardener”*
**Texture/Consistency-Overall**4%
*“the second batch I used today does not have the same smooth consistency as the first”*
**Leak-Proof**4%
*“Leaking”*
**Durability**4%
*“Wouldnt fully cure after 4 days”*
### **Top return reasons **
**Flexibility**16%
**Size-Overall**15%
**Material Quality**12%
**Functionality-Overall**11%
**Defective Material/Parts**9%
**Value For Money**7%
**Advertised Vs Actual Product**6%
**Strength**6%
**Quality-Overall**4%
**Compatibility-Overall**3%
## **Common questions**
- **Is fiberglass filler profitable to sell on Amazon United States?**
- The niche generates $277K/yr across 15 tracked products. 90-day search growth is +30.6%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the fiberglass filler niche?**
- 10 brands and 86 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 82% of demand.
- **What do buyers complain about in fiberglass filler?**
- Top complaints mined from reviews: Flexibility, Advertised Vs Actual Product, Hard Feel. The return rate is 0.3%.
- **When does demand for fiberglass filler peak?**
- Demand peaks in May; the busiest month runs 1.8× the quietest.
- **What does it cost to enter the fiberglass filler niche?**
- Listings span $7.31–$60.46; the average listing price is $33.19 (sweet spot $15–$100). The average incumbent carries 763 reviews — the moat a new listing must climb.
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