The best fairing compounds for fiberglass provide a strong, smooth finish that resists water and stays put on vertical or overhead surfaces. This guide highlights top options and who they’re best for, so you can choose the right epoxy or polyester fairing filler for boat hulls, decks, or repair projects. The listed products cover a range of kits, from pint to gallon sizes, and include both epoxy and polyester formulations. Below is a quick summary to compare key picks.
| Product | Type | Size | Best For |
|---|---|---|---|
| TotalBoat TotalFair (2 Pint) | Epoxy | 2 Pint Kit | Small to medium hull dents, dings above/below waterline |
| TotalBoat Polyester Fairing Compound (Quart) | Polyester | Quart Kit | Cosmetic repairs on gelcoat and fiberglass above waterline |
| TotalBoat TotalFair (2 Quart) | Epoxy | 2 Quart Kit | Medium to larger fairing tasks, durable waterline repairs |
| TotalBoat Polyester Fairing Compound (Gallon) | Polyester | Gallon Kit | Heavy bulk filling, deck or hull areas needing strength |
| MAS Epoxies Fairing Compound (2 Pint) | Epoxy | 2 Pint Kit | Pre-mixed, ready-to-use epoxy fairing for various substrates |
TotalBoat TotalFair Marine Epoxy Fairing Compound (2 Pint)
Targeted for high-strength, lightweight repairs, this two-part epoxy filler smooths rough spots and fills voids on boats, canoes, and similar watercraft. It forms a waterproof bond that resists pinholes and performs well above or below the waterline. The formula uses a 1:1 mix ratio, simplifying preparation and application.
- Best for small to mid-size dents, holes, and gouges in fiberglass, wood, aluminum, and steel.
- Better for permanent repairs where a waterproof finish matters.
Who it’s best for: boaters and repair pros handling mid-sized fairing tasks that require a durable, water-resistant epoxy finish. A potential limitation is the need to mix and feather carefully to avoid pinholes in very thin layers.
TotalBoat Polyester Fairing Compound (Quart)
This polyester-based filler is designed for cosmetic repairs on gelcoat, fiberglass, and other composites above the waterline. It spreads with a buttery consistency and dries with minimal sag on vertical surfaces, making it a versatile choice for quick cosmetic touch-ups and deck repairs.
- Best for cosmetic repairs on fiberglass and gelcoat above waterline.
- Choose this if you want a simple trowel-and-spread application without sag on vertical areas.
Best for: homeowners tackling visible surface defects or finishing work on fiberglass decks. Limitation: may require a finishing putty to achieve ultra-smooth results in some cases.
TotalBoat Polyester Fairing Compound (Gallon)
This larger gallon kit provides a robust polyester filler for more substantial fairing needs. It’s suitable for repairing and smoothing larger fiberglass areas, including decks and hulls, where durability and a feathered edge are important. It shares the same ease of use as the quart version, with a slightly longer working time depending on temperature.
- Best for larger repairs and continuous fairing projects.
- Better for projects requiring more material and consistent sanding over broad surfaces.
Best for: professional or serious DIY projects that demand higher volume. Caution: mixing and curing times can vary with environmental temperature, affecting work time.
TotalBoat TotalFair Marine Epoxy Fairing Compound (Gallon 2-Part Kit)
This is the larger 2-gallon version of the epoxy TotalFair fairing system designed for serious repairs on boats, canoes, and other watercraft. It offers the same waterproof, pinhole-free cure and a user-friendly 1:1 mix ratio to produce a smooth, durable finish that’s suitable for above or below the waterline work.
- Best for larger fairing jobs or multiple repairs on a boat or watercraft.
- Better for projects needing a single, long-lasting epoxy system with strong bonding.
Limitation: the larger kit requires more material handling and proper storage; ensure you mix only the amount you can apply within the working time.
MAS Epoxies Fairing Compound (2 Pint)
Pre-mixed epoxy fairing compound designed for strong, easy sanding and minimal sag on vertical or overhead applications. Its ready-to-use formulation minimizes additional mixing steps, making it convenient for quick repairs that demand good sanding characteristics and a smooth finish.
- Best for projects needing ready-mixed epoxy with good sanding properties.
- Choose this if you want to avoid separate catalyst handling and want straightforward application.
Limitation: as with many epoxy fillers, temperature and humidity can influence cure speed and work time. Plan applications accordingly.
Buying Guide: Key Considerations For Choosing A Fiberglass Fairing Compound
- Material type: Epoxy vs. Polyester. Epoxy offers stronger, more durable bonds and superior moisture resistance, while polyester cures faster and is easier to sand in some cases. Consider the exposure (above or below waterline) and required longevity.
- Project scope: Size and number of repairs. Pint or quart kits work well for small jobs, while gallons suit larger decks, hulls, or multiple sections.
- Working time and cure: Temperature affects pot life. Some products have ready-mixed formulas for ease, while others require precise catalyst ratios and time management for sanding.
- Sandability: Look for low-dust sanding and feathering capability for a smooth finish before painting or coating.
- Bond strength and waterproofing: For submersion areas, waterproof cures and robust adhesion are critical to long-term performance.
- Ease of application: 1:1 mix ratios and smooth consistency help minimize sag on vertical surfaces and expedite your workflow.
- Surface compatibility: Ensure the filler adheres well to fiberglass, gelcoat, wood, aluminum, or steel as needed by your project.
Frequently Asked Questions
- Q: Should I use epoxy or polyester for fiberglass fairing? A: Epoxy generally offers stronger adhesion and better water resistance, making it suitable for structural repairs, while polyester is often easier to apply for cosmetic, above-waterline work.
- Q: Can I use fairing compound on wood or metal? A: Yes, many products are formulated to bond with fiberglass, wood, aluminum, or steel, but check the product data for substrate compatibility.
- Q: Do these products require special ventilation or safety gear? A: Yes. Work in a well-ventilated area and use gloves and eye protection as recommended by the product’s safety data.
- Q: How long before sanding or coating? A: Cure times vary by product and temperature; follow the manufacturer’s guidelines for sanding readiness and recoating intervals.
- Q: Is a finishing putty needed after fairing? A: For very smooth surfaces, some setups pair a finishing putty with the fairing compound to achieve a flawless edge before painting.
- Q: Can I fair above and below the waterline with the same product? A: Many epoxy and some polyester fillers are designed for both areas, but always confirm performance under submerged conditions if applicable.