Best Epoxy Fillers

Are you looking for the
best epoxy fillers
to enhance your projects? I can help you discover
top-rated options
for a stronger, more durable finish!

Epoxy fillers are a game-changer for DIY enthusiasts and professionals alike. They strengthen, repair, and enhance projects with ease. Whether you’re fixing wood, metal, or resin, the right filler makes all the difference.

These versatile products come in various forms, from powders to putties, each designed for specific tasks. They boost strength, improve consistency, and create flawless finishes. With the right filler, your projects will be stronger and more durable.

Choosing the best epoxy filler can be overwhelming, but we’ve got you covered. Our guide highlights top-rated options tailored to your needs. Get ready to transform your projects with confidence and precision.

List of Top 10 Epoxy Fillers

Title	Best For	Price
Fasco Epoxies – Fasco Cab-O-SIL Fumed Silica thickener in Quart tub	This Fasco Cab-O-SIL Fumed Silica thickener is perfect for DIY enthusiasts, craftspeople, and professionals who need to easily thicken their epoxies, silicones, paints, and varnishes. If you’re looking to boost the stability and prevent sagging in your projects, this versatile powder is your go-to solution!	View on Amazon (paid link)
Fasco Epoxies White Glass Microspheres – Filler for Epoxy and Polyester Resin – Quart Tub	This Fasco Epoxies White Glass Microspheres product is perfect for DIY enthusiasts and boat builders who need to create a lightweight, strong filler for their epoxy or polyester resin projects. It’s ideal for fairing and improving the weight-to-strength ratio of your creations.	View on Amazon (paid link)
J-B Weld Tan KwikWood Wood Repair Epoxy Putty, 1 oz. Stick	This J-B Weld KwikWood is perfect for anyone who loves DIY projects or needs to fix wood around the house. It’s easy to use and great for small repairs like cracks, holes, or broken furniture.	View on Amazon (paid link)
WEST System® 404 High-Density Epoxy Filler \| Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting \| Made in The USA	WEST System® 404 High-Density Epoxy Filler is perfect for DIYers, woodworkers, and boat builders who need strong, gap-filling epoxy mixtures. It’s ideal for hardware bonding, filleting, and bridging large gaps without sagging.	View on Amazon (paid link)
Gorilla 2 Part Epoxy, Clear Epoxy, 0.85 Ounce Syringe (Pack of 1) – 5 Minute Set, Incredibly Strong Bonding	Gorilla 2 Part Epoxy is perfect for anyone who needs a strong, clear, and quick-drying fix. Whether you’re repairing household items or working on your car, this easy-to-use syringe gives you a durable bond in just 5 minutes.	View on Amazon (paid link)
Boncart Epoxy Putty, 200g Fast Repair AB Epoxy Putty, High-Strength Two-Part Filler for Metal, Wood, Tile, Ceramics, Multi-Purpose Sculpt Clay for Bonding, Repairing, Sculpting (White)	This Boncart Epoxy Putty is perfect for anyone who needs a fast, strong fix for broken items or creative projects. It’s great for DIY lovers, homeowners, and artists looking to repair, bond, or sculpt with ease.	View on Amazon (paid link)
Fiberglass Supply Depot Cabosil Fumed Silica (4oz Jar) – Resin Thickener for Non-Saggy Putty – Advanced Epoxy Resin Thickener – Professional Thixotropic Agent for Smooth Epoxy	Fiberglass Supply Depot Cabosil Fumed Silica is perfect for DIY enthusiasts and professionals who want to create smooth, non-saggy epoxy resin projects. Whether you’re working on custom blends or need precise control over your resin’s thickness, this product is easy to use and delivers reliable results.	View on Amazon (paid link)
Milled Fiberglass 1 LBS – Epoxy Thickener – Fiberglass Resin Filler Material for Epoxy, Vinyl Ester, and Polyester Resin Systems – Add to Fumed Silica Thickener for Repairing Holes, Cracks and Tears	This product is perfect for anyone who needs to repair holes, cracks, or tears in materials like fiberglass, plastic, or metal. It’s great for DIY projects, professional repairs, or industrial use in marine, automotive, or construction work.	View on Amazon (paid link)
PC Products PC-Woody Wood Repair Epoxy Paste Kit with Mixing Tool, Two-Part 6 oz in Two Cans, Tan (83321)	PC Products PC-Woody Wood Repair Epoxy Paste Kit is perfect for anyone who needs to fix damaged wood indoors or outdoors. It’s easy to use and works in all weather conditions, making it ideal for DIYers and homeowners.	View on Amazon (paid link)
Fiberglass Supply Depot White Glass Microspheres – Filler for Epoxy and Polyester Resin; 4 oz Jar	This Fiberglass Supply Depot White Glass Microspheres is perfect for DIY enthusiasts and boat builders who want to create lightweight fairing compounds and stronger, more stable resin projects. It’s ideal for anyone looking to improve the weight-to-strength ratio of their epoxy or polyester resin applications.	View on Amazon (paid link)

Detailed Reviews

Discover the ultimate guide to top-rated epoxy fillers, curated for flawless results. We’ve analyzed the best options to ensure your projects are both strong and beautiful. Dive in to find the perfect filler that will elevate your next creation.

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

Fasco Epoxies brings you Fasco Cab-O-SIL Fumed Silica, a lightweight powder that’s a breeze to use. Simply add it to any application for instant results. It’s the easy way to get the consistency you need.
This powerful thickener works wonders, boosting the viscosity of liquids and creating a non-sagging finish. Get ready for stronger, more stable projects with this multi-use marvel.

Pros	Cons
Thickens epoxy, silicone, paints, and more with ease. Strengthens gel coats, epoxies, and paints for durable results. Prevents sagging in fillers, fibers, and liquids effectively. Versatile for rubber reinforcement and ceramic rigidizing tasks.	Can create dust when not handled carefully. May require careful mixing for best results. Not a standalone adhesive; needs a base.

Perfect For:

This Fasco Cab-O-SIL Fumed Silica thickener is perfect for DIY enthusiasts, craftspeople, and professionals who need to easily thicken their epoxies, silicones, paints, and varnishes. If you’re looking to boost the stability and prevent sagging in your projects, this versatile powder is your go-to solution!

Ready to Purchase?

View Price on Amazon (paid link)

2. Fasco Epoxies White Glass Microspheres – Filler for Epoxy and Polyester Resin – Quart Tub

Fasco Epoxies White Glass Microspheres are your secret weapon for creating lightweight fairing compounds. Just mix them into your epoxy or polyester resin for a smoother, easier sanding finish.

These hollow glass bubbles are like magic! They boost strength while cutting down on weight. Plus, they make your projects super stable.

Pros	Cons
Sands easily for smooth finishes. Lightweight filler for your projects. Improves strength and stability. Easy to mix for perfect putty. Engineered for superior results.	Not for all resins, check compatibility before use. Limited strength for heavy-duty applications. Messy mixing required for best results.

Perfect For:

This Fasco Epoxies White Glass Microspheres product is perfect for DIY enthusiasts and boat builders who need to create a lightweight, strong filler for their epoxy or polyester resin projects. It’s ideal for fairing and improving the weight-to-strength ratio of your creations.

Ready to Purchase?

View Price on Amazon (paid link)

3. J-B Weld Tan KwikWood Wood Repair Epoxy Putty, 1 oz. Stick

J-B Weld KwikWood is your go-to solution for wood repairs. This easy-to-use putty stick makes fixing wood simple. It’s perfect for all your household DIY needs.

Mix it by hand, and it sets in 15-25 minutes. It cures to a light tan color in just 1 hour. You can then stain, mold, drill, and sand it to perfection.

With 900 PSI lap shear strength, it’s incredibly strong. Fix gouges, cracks, and dry rot with confidence.

Pros	Cons
Quickly repairs and rebuilds wood. Easy to mix and use by hand. Sets in 15-25 minutes, cures in 1 hour. Strong bond with 900 PSI strength. Moldable, shapable, and stainable after curing.	Quick set time may rush DIY projects. Small 1 oz. stick limits large repairs. Hand mixing required, no tools included.

Perfect For:

This J-B Weld KwikWood is perfect for anyone who loves DIY projects or needs to fix wood around the house. It’s easy to use and great for small repairs like cracks, holes, or broken furniture.

Ready to Purchase?

View Price on Amazon (paid link)

4. WEST System® 404 High-Density Epoxy Filler | Strong Structural Thickening Additive for Epoxy Resin Bonding and Filleting | Made in The USA

Get unbeatable strength for your projects with WEST System® 404 High-Density Epoxy Filler. This powerful additive is made right here in the USA. It’s designed to boost epoxy’s grip for tough jobs.

Perfect for securing hardware, this filler stops creeping. It makes your bonds super strong for fasteners and studs. You’ll get reliable results every time.

This filler creates thick, non-slumping mixtures. It’s easy to use and works with many WEST SYSTEM epoxies.

Pros	Cons
Super strong epoxy for tough jobs. Bonds hardware and studs securely. Fills gaps and makes strong fillets. Easy to control thickness.	Can trap air if overfilled. Off-white color may not match all projects.

Perfect For:

WEST System® 404 High-Density Epoxy Filler is perfect for DIYers, woodworkers, and boat builders who need strong, gap-filling epoxy mixtures. It’s ideal for hardware bonding, filleting, and bridging large gaps without sagging.

Ready to Purchase?

View Price on Amazon (paid link)

5. Gorilla 2 Part Epoxy, Clear Epoxy, 0.85 Ounce Syringe (Pack of 1) – 5 Minute Set, Incredibly Strong Bonding

Gorilla 2 Part Epoxy is a clear, strong bonding solution. It’s perfect for household and automotive repairs. The 0.85-ounce syringe is easy to use.

This epoxy dries clear for a clean finish. It sets in 5 minutes, giving you time to adjust. It’s water-resistant for extra durability.

The syringe design keeps the epoxy fresh. It dispenses evenly and includes a cap for reuse. Great for gap filling and uneven surfaces.

Pros	Cons
Dries clear for a clean finish. Sets fast in just 5 minutes. Fills gaps and bonds uneven surfaces. Water resistant for extra durability. Easy syringe for precise application.	Small size: Only 0.85 ounces, may not be enough for big projects. Quick set time: 5 minutes might feel rushed for complex tasks. Moderate water resistance: Not fully waterproof, limits outdoor use.

Perfect For:

Gorilla 2 Part Epoxy is perfect for anyone who needs a strong, clear, and quick-drying fix. Whether you’re repairing household items or working on your car, this easy-to-use syringe gives you a durable bond in just 5 minutes.

Ready to Purchase?

View Price on Amazon (paid link)

6. Boncart Epoxy Putty, 200g Fast Repair AB Epoxy Putty, High-Strength Two-Part Filler for Metal, Wood, Tile, Ceramics, Multi-Purpose Sculpt Clay for Bonding, Repairing, Sculpting (White)

Boncart Epoxy Putty, 200g Fast Repair AB Epoxy Putty, High-Strength Two-Part Filler for Metal, Wood, Tile, Ceramics, Multi-Purpose Sculpt Clay for Bonding, Repairing, Sculpting (White)

The Boncart Epoxy Putty is a fast-repair solution for various materials like metal, wood, and ceramics. This high-strength, two-part filler is easy to use and perfect for fixing holes, cracks, and leaks.

It mixes easily and sets quickly. You have 30 minutes to apply it before it hardens. After 24 hours, it can be sanded or painted.

Pros	Cons
Fixes leaks, cracks, and holes in many materials. Strong and durable, resists water, heat, and impact. Easy to use, mold, and shape for quick repairs. Safe, odorless, and harmless for all users. Versatile for bonding, sculpting, and filling anything.	Not for underwater use. Requires 24-hour cure time. Best used within 30 minutes.

Perfect For:

This Boncart Epoxy Putty is perfect for anyone who needs a fast, strong fix for broken items or creative projects. It’s great for DIY lovers, homeowners, and artists looking to repair, bond, or sculpt with ease.

Ready to Purchase?

View Price on Amazon (paid link)

7. Fiberglass Supply Depot Cabosil Fumed Silica (4oz Jar) – Resin Thickener for Non-Saggy Putty – Advanced Epoxy Resin Thickener – Professional Thixotropic Agent for Smooth Epoxy

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

Want to make your epoxy projects super smooth and sag-free? Fiberglass Supply Depot’s Cabosil Fumed Silica is your secret weapon. It’s the perfect thickener for a flawless finish.

This easy-to-use agent controls your resin’s thickness. It works alone or with other fillers to prevent drooping.

Get professional results every time. This 4oz jar of Cabosil is a game-changer for all your resin needs.

Pros	Cons
Thickens resin for non-saggy putty. Easy to mix and control viscosity. Improves epoxy performance and stability. Versatile for custom blends.	Small amount for big projects. Can be messy if not handled carefully. Requires mixing for best results.

Perfect For:

Fiberglass Supply Depot Cabosil Fumed Silica is perfect for DIY enthusiasts and professionals who want to create smooth, non-saggy epoxy resin projects. Whether you’re working on custom blends or need precise control over your resin’s thickness, this product is easy to use and delivers reliable results.

Ready to Purchase?

View Price on Amazon (paid link)

8. Milled Fiberglass 1 LBS – Epoxy Thickener – Fiberglass Resin Filler Material for Epoxy, Vinyl Ester, and Polyester Resin Systems – Add to Fumed Silica Thickener for Repairing Holes, Cracks and Tears

Milled Fiberglass 1 LBS - Epoxy Thickener - Fiberglass Resin Filler Material for Epoxy, Vinyl Ester, and Polyester Resin Systems - Add to Fumed Silica Thickener for Repairing Holes, Cracks and Tears

This milled fiberglass is a powerful reinforcement for your resin projects. It’s perfect for fixing holes, cracks, and tears. Get ready for super strong repairs.

Mixing this with resin boosts strength and stability. It also helps prevent shrinkage. Your projects will be more durable and precise.

This thickening agent makes resin easy to apply. It works with epoxy, vinyl ester, and polyester resins.

Pros	Cons
Reinforces and repairs with ease. Increases strength and stability. Thickens resin for better application. Works with many resin types. Versatile for many industries.	Dusty to handle, wear protection. Not for small jobs, best for big repairs. Can be messy if not mixed carefully.

Perfect For:

This product is perfect for anyone who needs to repair holes, cracks, or tears in materials like fiberglass, plastic, or metal. It’s great for DIY projects, professional repairs, or industrial use in marine, automotive, or construction work.

Ready to Purchase?

View Price on Amazon (paid link)

9. PC Products PC-Woody Wood Repair Epoxy Paste Kit with Mixing Tool, Two-Part 6 oz in Two Cans, Tan (83321)

Restore your wood with this amazing epoxy paste kit! It’s perfect for fixing rotted or missing wood. This tough paste resists water, UV light, and dry rot, making it ideal for indoor and outdoor projects.

It’s easy to use and stays put without dripping. Just mix the two parts and watch your wood become strong and new again!

Pros	Cons
Repairs rotted wood effectively. Resists water, UV, and dry rot. Works indoors and outdoors. Easy to mix and apply. Reduces drips for a clean finish.	Small mixes can be tricky. Gloves are not for mixing.

Perfect For:

PC Products PC-Woody Wood Repair Epoxy Paste Kit is perfect for anyone who needs to fix damaged wood indoors or outdoors. It’s easy to use and works in all weather conditions, making it ideal for DIYers and homeowners.

Ready to Purchase?

View Price on Amazon (paid link)

10. Fiberglass Supply Depot White Glass Microspheres – Filler for Epoxy and Polyester Resin; 4 oz Jar

Fiberglass Supply Depot White Glass Microspheres are engineered hollow glass microspheres that improve the weight to strength ratio of epoxy and polyester resin. They are easy to pour and store in a 4 oz jar.

These microspheres sand easily when added to resin, creating a lightweight fairing compound. Mix them with cabosil for a great general-purpose putty. They also improve dimensional stability.

Pros	Cons
Lightweight fairing compound. Easy to use and store. Boosts strength and stability. Creates a great putty with Cabosil. Engineered for performance.	Limited to specific uses, not a general filler. Small jar size may not last for large projects. Requires mixing with other products for best results.

Perfect For:

This Fiberglass Supply Depot White Glass Microspheres is perfect for DIY enthusiasts and boat builders who want to create lightweight fairing compounds and stronger, more stable resin projects. It’s ideal for anyone looking to improve the weight-to-strength ratio of their epoxy or polyester resin applications.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Epoxy fillers are a must-have for anyone looking to repair, strengthen, or enhance projects. They work on wood, metal, resin, and more. Choosing the right one can make your work stronger and more durable.

Engaging Experience:
Imagine fixing a cracked wooden table or creating a smooth, flawless finish on a DIY project. With the right epoxy filler, you’ll feel like a pro, achieving professional results every time.

Factors to Consider When Buying:
– Material Compatibility: Ensure the filler works with your project’s material, like wood, metal, or resin.
– Type of Filler: Choose between powders, putties, or microspheres based on your needs.
– Strength and Durability: Look for fillers with high strength and long-lasting results.
– Ease of Use: Opt for products that are easy to mix and apply.
– Setting Time: Consider how quickly the filler sets and cures for your project timeline.
– Finish: Decide if you need a clear, sanded, or paintable finish.
– Weight: For lightweight projects, choose fillers with hollow microspheres.
– Resistance: Check for water, UV, or chemical resistance if needed.
– Quantity: Buy the right amount to avoid waste or shortages.
– Brand Reputation: Trust top-rated brands for reliable performance.

With these tips, you’ll find the perfect epoxy filler for your projects.