---
title: "Cosmoline — $92K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/cosmoline"
last_updated: "2026-08-10T16:31:14.037Z"
locale: en
meta:
description: "Niche score 46/100 · $92K/yr market · 37K searches/yr · $74.08 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 46/100 · $92K/yr market · 37K searches/yr · $74.08 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Cosmoline — $92K/yr Amazon US Niche (2026) - Flapen"
---
# **cosmoline**
**Skip it**
A small market ($92K/yr) — this niche doesn't clear our bar today.
Market size 23Growth 34Conversion 43Competition 35Returns 93Price range 55Avg price 84Brand share 59Review moat 77Quality gap 24
**Returns**
**Great****1.1%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$74.08**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****457**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Good****69%**
top-5 brand share — brands hold most of the demand
**Price range**
**Good****$14.22–$168.09**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Okay****3.4%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****64%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+7.2%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$92K**
$92K/yr · 37K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, cosmoline is a $92K/yr Amazon United States market (37K searches/yr). The top 5 brands hold 69% of demand. Demand peaks in Apr–Oct. Verdict: Skip it — 46/100.
Data updated Jul 8, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **cosmoline market data**
- **Units sold / yr**
- **1K–2K**
- avg 100–250/product
- **Revenue / yr**
- **$93K–$111K**
- units × avg price
- **Conversion rate**
- **3.4%**
- **Avg BSR**
- **#359**
- **Page quality**
- **0%**
- **Prime**
- **53%**
- **Sponsored**
- **74%**
- **Out of stock**
- **3.9%**
- **Avg brand age**
- **74 months**
- **Avg seller age**
- **177 days**
## **Competition & brand share**
The top 5 products take 64% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**101**
**Top-5 brand share**
**69%**
Top 20: 100%
**Top-5 click share**
**64%**
Top 20: 100%
**Open market**
**23%**
- APOWUS21% - FraFr.gancia18% - Cosmoline Direct, LLC11% - RP Military-Grade Rust Preventatives10% - CRC9% - TEAYIR8%
## **Demand & seasonality**
Weekly Amazon search volume, last 89 weeks — +7.2% search growth over the last 90 days.
1K750Spike '25Spike '26 seasonNovDecJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Apr, Oct · busiest ÷ quietest = 2.0×
[**Open Trend **](https://flapen.com/research/us/automotive/cosmoline/trend)
## **Top cosmoline search terms**
- **cosmoline**21K/yr+10.4%2.5% conv. - **cosmoline rp-342**5K/yr+13.4%6.0% conv. - **rp-342**3K/yr+4.0%4.8% conv. - **cosmoline spray**2K/yr+0.4%2.4% conv. - **rp342**2K/yr-15.1%6.7% conv. - **cosmoline undercoating**3K/yr-7.5%3.7% conv. [**All search terms **](https://flapen.com/research/us/automotive/cosmoline/search-terms)
## **Top cosmoline 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%$9K20%$18K30%$28K40%$37K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 19 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Cosmoline RP-342 Heavy Rust Preventative Spray (Military-Grade) 3-Cans**APOWUS**$49.66**4.8★341 rev](https://www.amazon.com/dp/B01MRRYDMZ) [2**Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 3-Cans**FraFr.gancia**$49.82**4.8★322 rev](https://www.amazon.com/dp/B0888RNS9H) [3**Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans**Cosmoline Direct, LLC**$89.58**4.6★205 rev](https://www.amazon.com/dp/B0888PB5G7) [4**Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can**TEAYIR**$22.25**4.6★71 rev](https://www.amazon.com/dp/B0888RF571) [5**Cosmoline RP-342 Heavy Rust Preventative Spray (Military-Grade) 6-Cans**RP Military-Grade Rust Preventatives**$86.04**4.7★327 rev](https://www.amazon.com/dp/B01MTV41O0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**LHI 50L Tactical Duffle Bag for Men 3-in-1 Gym Duffle and Backpack Shoe Compartment Laptop Sleeve and MOLLE Carry-On Travel Weekender and Overnight Bag Black**LHI**$30.12**139 rev9mo ago](https://www.amazon.com/dp/B0FSL71VG3) [**STOVER Womens Convertible Garment Duffel Bag for Travel 2-in-1 Carry-On Weekender/Overnight Tote - Wrinkle-Free Dresses Suits & Clothes + Shoe Compartment & Bonus Toiletry Bag (Emerald Green)**STOVER**$56.31**96 rev9mo ago](https://www.amazon.com/dp/B0FR4LVRQ2) [**Halfday Convertible 2-in-1 Premium Garment Duffel Weekender Bag 40L: Wrinkle-Free Travel (Hanging Suit Compartment Shoe Pockets Trolley Sleeve) Balistic Nylon Carry-on Pacific**Halfday**$156.90**190 rev10mo ago](https://www.amazon.com/dp/B0FNS1LFXS) [**Halfday Convertible 2-in-1 Premium Garment Duffel Weekender Bag 45L: Wrinkle-Free Travel (Hanging Suit Compartment Shoe Pockets Trolley Sleeve) Balistic Nylon Carry-on Ash**Halfday**$168.09**190 rev11mo ago](https://www.amazon.com/dp/B0FLYNDL7Z) [**STOVER Garment Travel Duffle Bag Large 2-in-1 Convertible Carry-on Luggage for Men & Women- Hanging Suits Dresses & Clothes + Shoe Compartment- Weekender Tote Combo Duffel (Brown Leatherette)**STOVER**$60.32**250 rev2y ago](https://www.amazon.com/dp/B0D7BS89HH)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Halfday Convertible 2-in-1 Premium Garment Duffel Weekender Bag 40L: Wrinkle-Free Travel (Hanging Suit Compartment Shoe Pockets Trolley Sleeve) Balistic Nylon Carry-on Pacific**Halfday**$156.90**4.7★**▲ 297%**](https://www.amazon.com/dp/B0FNS1LFXS) [**STOVER Womens Convertible Garment Duffel Bag for Travel 2-in-1 Carry-On Weekender/Overnight Tote - Wrinkle-Free Dresses Suits & Clothes + Shoe Compartment & Bonus Toiletry Bag (Emerald Green)**STOVER**$56.31**4.3★**▲ 293%**](https://www.amazon.com/dp/B0FR4LVRQ2) [**Halfday Convertible 2-in-1 Premium Garment Duffel Weekender Bag 45L: Wrinkle-Free Travel (Hanging Suit Compartment Shoe Pockets Trolley Sleeve) Balistic Nylon Carry-on Ash**Halfday**$168.09**4.7★**▲ 292%**](https://www.amazon.com/dp/B0FLYNDL7Z) [**STOVER Garment Travel Duffle Bag Large 2-in-1 Convertible Carry-on Luggage for Men & Women- Hanging Suits Dresses & Clothes + Shoe Compartment- Weekender Tote Combo Duffel (Brown Leatherette)**STOVER**$60.32**4.1★**▲ 290%**](https://www.amazon.com/dp/B0D7BS89HH) [**LHI 50L Tactical Duffle Bag for Men 3-in-1 Gym Duffle and Backpack Shoe Compartment Laptop Sleeve and MOLLE Carry-On Travel Weekender and Overnight Bag Black**LHI**$30.12**4.6★**▲ 290%**](https://www.amazon.com/dp/B0FSL71VG3)
**~~View all trending →~~**
## **What buyers say about cosmoline**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**20%
*“It has the feel of a premium product that is very well made”*
**Rusts/Corrodes**14%
*“Rust proofing”*
**Value For Money**11%
*“Worth it”*
**Durability**8%
*“Durable and easy to use”*
**Storage Capacity**5%
*“Plenty of room”*
**Strength**4%
*“Holding up good so far”*
**Design-Overall**4%
*“Well made in terms of design, versatility and quality”*
**Pockets/Compartments**3%
*“Pretty bag with lots of pockets”*
**Size-Overall**2%
*“the perfect size”*
**Zipper Quality**2%
*“Looks great and the zippers were fairly easy”*
### **What buyers complain about **
**Rusts/Corrodes**13%
*“Everything was beginning to rust again”*
**Value For Money**5%
*“its expensive as fuq”*
**Adhesion/Stickiness**5%
*“This stuff doesn't stick”*
**Color**5%
*“The color was darker that it looked on the web site”*
**Quality-Overall**4%
*“Is a little cheap looking”*
**Weight Heavy**4%
*“Too heavy without wheels”*
**Spray/Flow**3%
*“Not compatible with spray wands with a female can interface”*
**Wheel Quality**3%
*“One regret is not on wheels”*
**Advertised Vs Actual Product**3%
*“didnt get the flag, like it shows on picture”*
**Material Quality**3%
*“Material was fairly cheap”*
### **Top return reasons **
**Size-Overall**48%
**Zipper Quality**9%
**Advertised Vs Actual Product**7%
**Color**5%
**Weight Heavy**5%
**Material Quality**3%
**Width**3%
**Wrong Dimensions**2%
**Strength**2%
**Shape/Style**2%
## **Common questions**
- **Is cosmoline profitable to sell on Amazon United States?**
- The niche generates $92K/yr across 19 tracked products. 3 of 4 products launched in the last 360 days are still selling. 90-day search growth is +7.2%. Flapen's verdict: Skip it (46/100).
- **How competitive is the cosmoline niche?**
- 13 brands and 101 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 69% of demand.
- **What do buyers complain about in cosmoline?**
- Top complaints mined from reviews: Rusts/Corrodes, Value For Money, Adhesion/Stickiness. The return rate is 1.1%.
- **When does demand for cosmoline peak?**
- Demand peaks in Apr–Oct; the busiest month runs 2.0× the quietest.
- **What does it cost to enter the cosmoline niche?**
- Listings span $14.22–$168.09; the average listing price is $74.08 (sweet spot $15–$100). The average incumbent carries 457 reviews — the moat a new listing must climb.
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