liquid plastic
Worth a lookShows a sweet-spot price point ($29.67 avg), but soft demand (+0.1% this quarter) keeps it on the watch list.
Avg price
Incredible$29.67avg listing price — sweet spot $15–$100
Returns
Great1.1%return rate — above 5% kills the launch gate
Price range
Great$6.41–$120.15cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good43%top-5 click share — leaders hold, buyers still browse
Conversion
Good4.2%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.5★avg incumbent rating — lower means beatable quality
Brand share
Okay84%top-5 brand share — brands hold most of the demand
Review moat
Okay3,201.29avg incumbent reviews — the moat a new listing must climb
Market size
Okay$108K$108K/yr · 86K searches
Growth
Okay+0.1%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, liquid plastic is a $108K/yr Amazon United States market (86K searches/yr). The top 5 brands hold 84% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 10, 2026 · scored weekly · How we score niches
liquid plastic market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $89K–$119K
- units × avg price
- Conversion rate
- 4.2%
- Avg BSR
- #251
- Page quality
- 0%
- Prime
- 94%
- Sponsored
- 90%
- Out of stock
- 0.6%
- Avg brand age
- 65 months
- Avg seller age
- 151 days
Competition & brand share
The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.Brands
13 falling
Sellers
81
Top-5 brand share
84%
Top 20: 100%
Top-5 click share
43%
Top 20: 86%
Open market
13%
- Smooth-On53%
- EUPHENG10%
- J-B Weld9%
- Smooth-On, Inc.8%
- LET'S RESIN4%
- FGCI3%
- Open — no brand owns it (7 brands, 13%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +0.1% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top liquid plastic search terms
- liquid plastic23K/yr
- smooth on silicone14K/yr
- smooth on15K/yr
- liquid plastic that hardens10K/yr
- smooth cast 3005K/yr
- smooth-on4K/yr
- mold star3K/yr
- plastic resin3K/yr
- smooth on resin3K/yr
- smooth cast2K/yr
Top liquid plastic 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Smooth-Cast 300 - Bright White Ultra Low Viscosity Liquid Plastic - Pint Unit
Smooth-On$25.744.7★1,318 rev
Smooth-On Mold Star 16 Fast Platinum Silicone Rubber Silicone Mold Making Kit - Pint Unit
Smooth-On$35.944.6★778 rev
Smooth-On Mold Star 30 Silicone Mold Making Kit - Easy to Use & Long-Lasting Silicone Mold (2-Pound)
Smooth-On$36.174.6★743 rev
Smooth-On Smooth-Cast 305 Liquid Plastic Resin for Special Effects & More White - Pint Unit
Smooth-On$28.834.6★222 rev
J-B Weld 50139 Plastic Bonder Body Panel Adhesive and Gap Filler Syringe - Black - 25 ml
J-B Weld$7.634.6★18,716 rev
Newest
by launch date
GranPeak 8 Strand Braided Fishing Line Pro-Grade Performance PE Braided Line Zero Stretch Smooth Casting Abrasion Resistant High Density and High Visibility (Green 30 LB (300 Yards))
GranPeak$19.9925 rev
Eupheng PlastiCatch Series Plastisol Fishing Lure Making Plastic Rubber Crystal Clear Low Odor Non Yellowing Medium Formula for DIY Fishing Lures
EUPHENG$25.7526 rev
Eupheng PlastiCatch Series Plastisol Fishing Lure Making Plastic Rubber Crystal Clear Low Odor Non Yellowing Medium Formula for DIY Fishing Lures
EUPHENG$16.7626 rev
WANJAO Tool Dip Rubber Coating Liquid Rubber Dip Flexible Peelable Protective Coating Rubber Coating Sealant Waterproof Flexible Slip Resistance for DIY Craft 150g Black Bottle Open Size 1 Inch
WANJAO$13.44117 rev
BBDINO Silicone Mold Making Kit Liquid Silicone for Molds Making 30A Sapphire Blue High Strength Silicon Rubber 4.4 lbs 1:1 by Volume Ideal for Mold Casting of Resin/Jewelry/Candle/Concrete/Plaster
BBDINO$44.873,180 rev
Trending
90-day click momentumEupheng PlastiCatch Series Plastisol Fishing Lure Making Plastic Rubber Crystal Clear Low Odor Non Yellowing Medium Formula for DIY Fishing Lures
EUPHENG$16.764.0★
Eupheng PlastiCatch Series Plastisol Fishing Lure Making Plastic Rubber Crystal Clear Low Odor Non Yellowing Medium Formula for DIY Fishing Lures
EUPHENG$25.754.0★
FGCI Clear Casting Polyester and UV Resin Kit 8 Pound Bulk Liquid Plastic for Realistic Fake Water Craft Casting and Decorative Projects
FGCI$87.884.4★
GranPeak 8 Strand Braided Fishing Line Pro-Grade Performance PE Braided Line Zero Stretch Smooth Casting Abrasion Resistant High Density and High Visibility (Green 30 LB (300 Yards))
GranPeak$19.994.5★
WANJAO Tool Dip Rubber Coating Liquid Rubber Dip Flexible Peelable Protective Coating Rubber Coating Sealant Waterproof Flexible Slip Resistance for DIY Craft 150g Black Bottle Open Size 1 Inch
WANJAO$13.444.0★
What buyers say about liquid plastic
What buyers praise and complain about, mined from review topics.What buyers love
“Reliable product that does exactly what it promises”
“Easy to work with”
“did work”
“As advertised”
“Good stick”
“Reasonably priced”
“Nice material”
“Having a reliable”
“The instructions are clear”
“It holds strongly on rigid surfaces”
What buyers complain about
“Not good adhesion”
“It is a little pricey”
“all with negative results”
“the durability is poor”
“Arrived leaking”
“Hard to use”
“But I didnt understand the sizing”
“Garbage”
“Weak hold”
“Horrible smell too”
Top return reasons
Common questions
- Is liquid plastic profitable to sell on Amazon United States?
- The niche generates $108K/yr across 31 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +0.1%. Flapen's verdict: Worth a look (51/100).
- How competitive is the liquid plastic niche?
- 13 brands and 81 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 84% of demand.
- What do buyers complain about in liquid plastic?
- Top complaints mined from reviews: Adhesion/Stickiness, Value For Money, Functionality-Overall. The return rate is 1.1%.
- When does demand for liquid plastic peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the liquid plastic niche?
- Listings span $6.41–$120.15; the average listing price is $29.67 (sweet spot $15–$100). The average incumbent carries 3,201 reviews — the moat a new listing must climb.