10 Best Epoxy Fairing Filler of 2025

Tested and Reviewed: Top 10 Epoxy Fairing Filler deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

TotalBoat

TotalBoat TotalFair Marine Epoxy Fairing Compound for Fiberglass, Wood, Aluminum and Steel (2 Pint Kit)

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Editor's bottom line:

“This epoxy fairing filler is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

HIGH-STRENGTH, LIGHTWEIGHT TWO-PART EPOXY FILLER smooths out the rough spots and fills the voids; ideal for filling and fairing dents, holes and gouges on your boat, canoe or other watercraft. Marine-grade putty is also great for home, rv and auto repair.
SUPER SMOOTH FINISH FOR PERMANENT, WATERPROOF REPAIRS: Marine filler bonds strongly to damaged areas and cures without pinholes on wood, aluminum, steel and fiberglass repair areas; cured TotalFair is waterproof; use above and below the waterline.
NEW IMPROVED FORMULA EASY TO MIX AND APPLY: Foolproof 1 to 1 mix ratio - just mix blue and yellow components until they turn green. Now easier to scoop, mix, spread, and feather to a fine edge; won't sag on vertical and overhead surfaces.
CURES FAST. EASY TO SAND AND PAINT: Quick-drying compound is ready to sand in just 4 hours at 80°F; cured fairing compound sands even easier with improved formula; compatible with latex and epoxy primers and paints
CHOOSE KIT SIZE: 2-PINT KIT, 2-QUART KIT or 1-GALLON KIT. NOTE: TotalBoat Gelcoat should not be applied directly over TotalFair or gelcoat will not cure properly. Before applying gelcoat, apply TotalBoat 2-Part Epoxy Primer or TotalProtect over TotalFair.

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Picked by 397 people today

9.5

Fasco Epoxies

Fasco Epoxies White Glass Microspheres - Filler for Epoxy and Polyester Resin - Quart Tub

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Main Highlights

Sands Easy Added to epoxy or polyester to make a lightweight fairing compound
Also Called Glass Bubbles
Microspheres Improves the Weight to Strength Ratio Improves Dimensional Stability
When added with our cabosil (equal parts by volume) it makes a great general purpose putty
engineered hollow glass microspheres

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9.5

West System

West System 407-5 Low Density Filler 4 oz

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Main Highlights

407 Low-Density is a blended microballoon-based fairing filler for WEST SYSTEM Epoxy.
Add 407 to a mixture of epoxy resin/hardener to create a fairing putty.
Blended with epoxy to a peanut butter consistency, it will be easy to fair.
Cures to a dark red/brown color.
You can blend it into any WEST SYSTEM 105 Resin/20X Hardener combination, G/flex Epoxy 650, or G/5 Five-Minute Adhesive.

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9.2

MAS

MAS Epoxies Fairing Compound, Pre-Filled Epoxy Fairing Compound for Fiberglass, Wood, and Marine Repair, Easy Sanding, Non-Sag, Smooth Texture, Body Filler Alternative for Boat Surfaces (2 Pint Kit)

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Main Highlights

READY-MIXED FAIRING EPOXY: No need for extra fillers. This epoxy fairing compound is pre-blended and ready to gojust mix the blue and yellow components to a consistent green for perfect prep.
EXCELLENT SAG RESISTANCE: Apply on vertical or uneven fiberglass, marine panels, or wood surfaces without dripping. Perfect for boat fairing, hull smoothing, or body filler replacement jobs.
EASY TO SAND: Once cured, this epoxy filler sands down easily with minimal airborne dust. Ideal for surface finishing before painting or coating on marine and fiberglass repair kits.
FAST DRYING FORMULA: Ready to sand in just 6 hours at 70°F. Save time and complete your fiberglass repair or wood fairing job in a single day with this time-saving epoxy compound.
MULTIPURPOSE MARINE USE: Great for fiberglass filler, void filling, barrier coating, or cosmetic fairing on boats and watercraft. Smooth application and excellent adhesion every time.

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9.0

TotalBoat

TotalBoat TotalFair Marine Epoxy Fairing Compound for Fiberglass, Wood, Aluminum and Steel (2 Quart Kit)

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Main Highlights

HIGH-STRENGTH, LIGHTWEIGHT TWO-PART EPOXY FILLER smooths out the rough spots and fills the voids; ideal for filling and fairing dents, holes and gouges on your boat, canoe or other watercraft. Marine-grade putty is also great for home, rv and auto repair.
SUPER SMOOTH FINISH FOR PERMANENT, WATERPROOF REPAIRS: Marine filler bonds strongly to damaged areas and cures without pinholes on wood, aluminum, steel and fiberglass repair areas; cured TotalFair is waterproof; use above and below the waterline.
NEW IMPROVED FORMULA EASY TO MIX AND APPLY: Foolproof 1 to 1 mix ratio - just mix blue and yellow components until they turn green. Now easier to scoop, mix, spread, and feather to a fine edge; won't sag on vertical and overhead surfaces.
CURES FAST. EASY TO SAND AND PAINT: Quick-drying compound is ready to sand in just 4 hours at 80°F; cured fairing compound sands even easier with improved formula; compatible with latex and epoxy primers and paints.
CHOOSE KIT SIZE: 2-PINT KIT, 2-QUART KIT or 1-GALLON KIT. NOTE: TotalBoat Gelcoat should not be applied directly over TotalFair or gelcoat will not cure properly. Before applying gelcoat, apply TotalBoat 2-Part Epoxy Primer or TotalProtect over TotalFair.

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8.8

TotalBoat

TotalBoat TotalFair Marine Epoxy Fairing Compound for Fiberglass, Wood, Aluminum and Steel (Gallon 2-Part Kit)

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Main Highlights

HIGH-STRENGTH, LIGHTWEIGHT TWO-PART EPOXY FILLER smooths out the rough spots and fills the voids; ideal for filling and fairing dents, holes and gouges on your boat, canoe or other watercraft. Marine-grade putty is also great for home, rv and auto repair.
SUPER SMOOTH FINISH FOR PERMANENT, WATERPROOF REPAIRS: Marine filler bonds strongly to damaged areas and cures without pinholes on wood, aluminum, steel and fiberglass repair areas; cured TotalFair is waterproof; use above and below the waterline.
NEW IMPROVED FORMULA EASY TO MIX AND APPLY: Foolproof 1 to 1 mix ratio - just mix blue and yellow components until they turn green. Now easier to scoop, mix, spread, and feather to a fine edge; won't sag on vertical and overhead surfaces.
CURES FAST. EASY TO SAND AND PAINT: Quick-drying compound is ready to sand in just 4 hours at 80°F; cured fairing compound sands even easier with improved formula; compatible with latex and epoxy primers and paints.
CHOOSE KIT SIZE: 2-PINT KIT, 2-QUART KIT or 1-GALLON KIT. NOTE: TotalBoat Gelcoat should not be applied directly over TotalFair or gelcoat will not cure properly. Before applying gelcoat, apply TotalBoat 2-Part Epoxy Primer or TotalProtect over TotalFair.

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8.6

TotalBoat

TotalBoat Polyester Fairing Compound (Quart Kit)

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Main Highlights

PREMIUM MARINE-GRADE 2-part polyester fiberglass filler and fairing compound for cosmetic repairs on gelcoat, fiberglass and other composite surfaces above the waterline; fill pinholes, print-through, spider cracks, sanding marks & other surface defects
VERSATILE FIBERGLASS FAIRING COMPOUND has multiple uses, including repairing fiberglass parts & molds, and quick cosmetic repairs to fiberglass decks and hulls
EASY TO APPLY by trowel or spreader; buttery consistency spreads smoothly to a feathered edge, and won't sag on vertical surfaces; ideal as a finishing putty over high-strength TotalBoat Polyester Structural Repair Putty
CURES FAST, EASY TO SAND: Fast-setting fairing filler cures in just 20-30 minutes at 77°F, with minimal shrinkage and no pinholes; easy to sand smooth in preparation for gelcoat or primer and paint
AVAILABLE IN 2 SIZES: QUART KIT AND GALLON KIT: Each includes MEKP catalyst; At 77°F, add 14-16 drops of MEKP to one ounce of TotalBoat Polyester Fairing Compound for a working time of 10-15 minutes, with a cure time of roughly 20-30 minutes

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8.3

West System

FILLER MICROLIGHT 5 OZ

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Main Highlights

410 Microlight is the ideal low-density filler.
When blended with epoxy, it creates a light, easily-worked epoxy fairing compound.
Especially suited for fairing large areas.
After epoxy thickened with 410 cures, it is about 30% easier to sand than most other epoxy-based fairing compounds.
Not recommended for use under dark paint, or other surfaces subject to high temperatures.

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8.1

West System

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

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Main Highlights

High-density epoxy thickening additive for strength Made in the USA WEST SYSTEM 404 High-Density Filler is used to maximize epoxys adhesive properties in hardware bonding and other applications where high cyclic loads or maximum bond strength are required.
Excellent for hardware and stud bonding Even small amounts added to epoxy resin and hardener reduce creep in the cured epoxy, making this filler well suited for hardware, fastener, and stud bonding applications.
Creates strong, non-slumping epoxy mixtures Mixed with epoxy, this filler produces a gap-filling adhesive capable of forming structural fillets or bridging large gaps without sagging, reducing the need for tight joinery.
Compatible with multiple WEST SYSTEM epoxies 404 High-Density Filler can be blended with WEST SYSTEM 105 resin and 20X hardeners, G/flex 650 epoxy, or G/5 five-minute adhesive and cures to an off-white color.
Viscosity controlled by filler amount The amount added determines epoxy thickness, from a loose slurry to thicker mixes. For best results, use only enough filler to bridge gaps without trapping air and avoid overfilling the mixing cup.

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8.1

Fiberglass Supply Depot

Phenolic Microballoons – 1 Quart Lightweight Marine Epoxy Filler for Boat Fairing, Fiberglass Hull Repair & Composite Fairing

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Main Highlights

Lightweight Marine Fairing Filler Phenolic microballoons reduce epoxy density, creating easy-to-sand fairing compounds ideal for hulls, decks, and fiberglass repairs without adding unnecessary weight.
Designed for Epoxy Resin Systems Optimized for use with marine epoxies to create smooth, workable putties for filling pinholes, cracks, seams, and surface imperfections.
Easy Sanding & Shaping Produces a low-density filler that sands effortlessly, saving time and labor during fairing and finishing of boat hulls and composite structures.
Improves Sag Resistance Thickens epoxy for vertical and overhead applications, helping repairs stay in place on transoms, stringers, bulkheads, and cabin sides.
Custom Blend Compatible Can be mixed with other marine fillers (fibers, silica, milled glass) to fine-tune strength, texture, and workability for specific repair needs.
Ideal for Non-Structural Fairing Perfect for cosmetic fairing and surface leveling prior to gelcoat, paint, or barrier coat application (not intended for structural bonding).

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Our Best Overall Choice

Best Choice

9.7

TotalBoat

TotalBoat TotalFair Marine Epoxy Fairing Compound for Fiberglass, Wood, Aluminum and Steel (2 Pint Kit)

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

HIGH-STRENGTH, LIGHTWEIGHT TWO-PART EPOXY FILLER smooths out the rough spots and fills the voids; ideal for filling and fairing dents, holes and gouges on your boat, canoe or other watercraft. Marine-grade putty is also great for home, rv and auto repair.
SUPER SMOOTH FINISH FOR PERMANENT, WATERPROOF REPAIRS: Marine filler bonds strongly to damaged areas and cures without pinholes on wood, aluminum, steel and fiberglass repair areas; cured TotalFair is waterproof; use above and below the waterline.
NEW IMPROVED FORMULA EASY TO MIX AND APPLY: Foolproof 1 to 1 mix ratio - just mix blue and yellow components until they turn green. Now easier to scoop, mix, spread, and feather to a fine edge; won't sag on vertical and overhead surfaces.
CURES FAST. EASY TO SAND AND PAINT: Quick-drying compound is ready to sand in just 4 hours at 80°F; cured fairing compound sands even easier with improved formula; compatible with latex and epoxy primers and paints
CHOOSE KIT SIZE: 2-PINT KIT, 2-QUART KIT or 1-GALLON KIT. NOTE: TotalBoat Gelcoat should not be applied directly over TotalFair or gelcoat will not cure properly. Before applying gelcoat, apply TotalBoat 2-Part Epoxy Primer or TotalProtect over TotalFair.

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