Top 10 Best cabosil in 2026

Last Updated - 6/25/2026

🏆Best Choice

Fasco Epoxies

Fasco Epoxies - Fasco Cab-O-SIL Fumed Silica thickener in Quart tub

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Cabosil – Also called fumed silica, it is a hydrophilic silica powder, a lightweight material that is easy to use and can be added to any application
•Thickener - Thickening powder for epoxy, silicone, paints, varnishes, and liquids significantly increases the viscosity of the liquid and produces a non-sagging property.
•Strong Adhesive - Fumed silica has strong stability, making it easy to strengthen gel coat, epoxy, polyester, paint and so on. It is also used to make ceramic blanket rigidizer.
•Multi Usage – Cabosil is suitable for thickening epoxy resin. Additionally, it is suitable for rubber reinforcement, and can also be combined with fillers or fibers to prevent them from sagging.

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$12.99

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West System

West System 406-7 Collodial Silica 5.5oz, off-white

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•406 Colloidal Silica is an epoxy thickening additive used to control the viscosity of the epoxy.
•Prevents epoxy runoff in vertical and overhead joints.
•Can be used to improve strength, abrasion resistance, and consistency of epoxy fairing compounds.
•Cures to an off-white color.

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$36.22

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Fiberglass Supply Depot

Cabosil Fumed Silica (4oz Jar) - Resin Thickener for Non-Saggy Putty - Advanced Epoxy Resin Thickener - Professional Thixotropic Agent for Smooth Epoxy

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Optimal Solution: Fiberglass Supply Depot Inc.’s colloidal silica is a must-have product for those of you who want to work with smooth, non-saggy epoxy resin. This product acts as a premium thixotropic agent that allows you to control the viscosity of mixed epoxy systems.
•Easy to Use: This epoxy thickener is designed to be used alone for a smooth and non-sagging high-strength mixture. Additionally, it can also be combined with fillers or fibers to prevent them from sagging.
•Designed for Resin: This fumed silica is formulated to provide sag resistance, as well as anti-settling and anti-corrosive performance. Our colloidal silica ensures high shelf stability and mechanical reinforcement in epoxy coatings.
•Small Size: Our fumed silica comes in a 4oz package and can be mixed with other fillers to create custom blends. Cabosil can be added to any type of resin mix and simply stirred by hand.
•Technical Features: This Cabosil filler may be synthesized by high temperature hydrolysis of SiCl4 in O2(N2)/H2 flame. The formula is amorphous and it possesses a very high specific area. The microdroplets of amorphous silica fuse into a branch and form a chain-like agglomerate, which helps to thicken the resin mixture.

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$6.89

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Fasco Epoxies

Fasco Epoxies Cabosil - Fumed Silica Thickener in Gallon Tub

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Thickener - Thickening powder for epoxy, silicone, paints, varnishes, and liquids significantly increases the viscosity of the liquid and produces a non-sagging property
•Strong Adhesive - Fumed silica has strong stability, making it easy to strengthen gel coat, epoxy, polyester, paint and so on; It is also used to make ceramic blanket rigidizer
•Multi Usage – Cabosil is suitable for thickening epoxy resin; Additionally, it is suitable for rubber reinforcement, and can also be combined with fillers or fibers to prevent them from sagging
•Hydrophilic surface

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$24.99

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Stone Coat Countertops

Stone Coat Countertops Epoxy Thickener (0.5 lb) Thickening Agent for Vertical, Sloped, and 3D Epoxy Projects, Boosts Bond Strength for MDF, Plywood, and Seaming, Non-Hazardous and Made in the USA

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•EXTEND THE LIFESPAN OF YOUR EPOXY – Mix Epoxy Thickener with clear epoxy from Stone Coat Countertops to increase the hardness, tensile, and elongation of your epoxy! When finished, the surface of your project will be ultra-smooth and strong enough to last for years to come!
•MADE TO INCREASE VISCOSITY – Epoxy Thickener increases the viscosity of vertical, sloped, or 3D epoxy projects! Use Epoxy Thickener for showers, kitchens, counters, bathrooms, woodworking projects, and so much more!
•ADD UP TO A 1:1 RATIO – Each bag of Epoxy Thickener is enough to mix with a 1 Gallon kit of Quick Coat Epoxy from Stone Coat Countertops. Be sure to mix your epoxy thickener powder at a 1:1 ratio for maximum versatility and durability.
•GREAT FOR WOODWORKING – Mix Epoxy Thickener with Quick Coat Epoxy to fill voids and seal cracks in wood slabs! Recommended for river tables, table tops, bar tops, and other woodworking projects!
•SAFE AND NON-TOXIC – Epoxy Thickener is made from Polyethylene fibers (Polyfiber) with non-silica formula! Polyfiber is non-toxic, non-hazardous, and made in the USA! Easy to clean, easy to mix, and easy to use!

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$14.99

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TITGGI

1 Quart 100% Pure Fumed Silica Powder, Advanced Thickener for Epoxy, Paints, Varnishes, Professional Fumed Silica for Filling Cracks and Voids, Worked Well for Ceramic Blanket Rigidizer - by TITGGI

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•100% Pure - Professional fumed silica, hydrophilic silica powder with a specific surface area of 200, is a lightweight material that is easy to use and can be added to any application with just hand stirring, also known as gas-phase silica or colloid.
•Paint Thickener - Thickening powders for epoxy, silicone, paints, varnishes, and liquids significantly increase the viscosity of the liquid system and produce non-sagging properties. TITGGI fumed silica is an excellent touch-changing agent.
•Strong Adhesive - Fumed silica is highly temperature resistant, has strong stability, creates non-sagging properties, can repair holes & thicken sailboat hull gel coat, it is also to make ceramic blanket rigidizer.
•Multi Usage - Fumed silica suitable for thickening epoxy resin for dreamer and resin art. Additionally, it is suitable for rubber reinforcement, and can also be combined with fillers or fibers to prevent them from sagging.
•Look for TITGGI fumed silica powder to achieve unparalleled results in your projects. With its fine, lightweight particles, TITGGI fumed silica ensures optimal dispersion and superior effectiveness, making it an essential ingredient for high-quality applications. Trust TITGGI for precise, reliable results and elevate your work to the next level.

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$13.23

$17.88

-26%

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SYSTEMTHREE

System Three Silica Thickener, 1 Qt Tub, White

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Premium Thickener: Also referred to as colloidal or hydrophilic fumed silica, our silica thickener is an excellent thixotropic agent designed to help control the viscosity of mixed epoxy systems
•Measure And Mixing: Mix the amount of resin, Part A, and hardener, Part B, desired, then add silica thickener in increments, and mix thoroughly, stirring from the bottom to the top until the desired consistency is reached
•Features: This epoxy thickener easily mixes into epoxy resin systems
•Consistency: Silica Thickener can be used alone to create a very smooth, non-sagging, high-strength mixture, but can also be combined with other fillers or fibers to prevent sagging
•Cleanup: Clean hands, exposed skin, and work surfaces with mild soap and water

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$14.95

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Fiberglass Supply Depot

Fiberglass Supply Depot - Cabosil Fumed Silica - Resin Thickener for Non-Saggy Putty - Advanced Epoxy Resin Thickener - Professional Thixotropic Agent for Smooth Epoxy - Easy to Use (1 Quart)

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Optimal Solution: Fiberglass Supply Depot Inc.’s colloidal silica is a must-have product for those of you who want to work with smooth, non-saggy epoxy resin. This product acts as a premium thixotropic agent that allows you to control the viscosity of mixed epoxy systems.
•Easy to Use: This epoxy thickener is designed to be used alone for a smooth and non-sagging high-strength mixture. Additionally, it can also be combined with fillers or fibers to prevent them from sagging.
•Designed for Resin: This fumed silica is formulated to provide sag resistance, as well as anti-settling and anti-corrosive performance. Our colloidal silica ensures high shelf stability and mechanical reinforcement in epoxy coatings.
•Large Size: Our fumed silica comes in a 1-quart package and can be mixed with other fillers to create custom blends. Cabosil can be added to any type of resin mix and simply stirred by hand.
•Technical Features: This Cabosil filler may be synthesized by high temperature hydrolysis of SiCl4 in O2(N2)/H2 flame. The formula is amorphous and it possesses a very high specific area. The microdroplets of amorphous silica fuse into a branch and form a chain-like agglomerate, which helps to thicken the resin mixture.

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$12.99

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TotalBoat

TotalBoat Fumed Silica Cabosil Powder Thickener for Epoxy Resin, Polyester Resin, Paint, Silicone, and Varnish (5 Quart)

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Hydrophilic fumed silica, also known as cabosil or colloidal silica, is a thixotropic additive thickening agent that lets you customize the viscosity of epoxy, polyester resin, paint and more
•Epoxy thickened with this fine silica powder won’t sag or slump, ideal for vertical and overhead surfaces. Easy to stir into mixed resin and hardener, and easy to sand upon full cure
•It creates a smooth, strong epoxy compound ideal for bonding, filleting, and filling. Epoxy or polyester resin thickened with silica can be used to fill holes, cracks, and gaps
•Combine this versatile filler with TotalBoat epoxy and Glass Micro Balloons or Milled Glass Fibers for easy sanding and additional strength
•Use with gelcoat, paints, acrylics, silicones, rubber, urethanes, adhesives and other materials to prevent sagging. Available in 1 Quart and 5 Quart sizes

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$25.99

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CABOT

CAB-O-SIL M5, Epoxy Thickener, 10 lb.

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Item: Mailbox Lock
•For Use With: 4C Pedestal Mailboxes
•Features: Short Throw
•Country of Origin (subject to change): China

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$150.99

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