Fairing Compounds
Interlux Paint YAA813HG Interfill 833 Fine Finishing Fairing Compound Part A Base 1/2 Gallon
Sika 606547 SikaBiresin AP077 White Polyester Filler and Fairing Compound - 1 Gallon (BPO Hardener Required)
Fairing compounds are specialized fillers used to correct surface imperfections on hulls, decks, and composite structures, creating a smooth, even profile essential for optimal paint adhesion and hydrodynamic performance. Whether you're restoring a classic boat, repairing gelcoat damage, or preparing a surface for a high-gloss finish, these two-part epoxy or polyester systems fill gouges, pitting, dents, and weld seams while sanding to a feather edge for seamless results.
Epoxy vs. Polyester: Choosing the Right Formula
Polyester fairing compounds cure quickly and offer cost-effective solutions for above-waterline cosmetic repairs, while epoxy compounds deliver superior strength and waterproof performance ideal for both above and below waterline applications. Epoxy fairing compounds are 100% waterproof when cured and form stronger bonds than polyester, making them recommended for structural repairs in addition to cosmetic work. Most epoxy formulations work on fiberglass, wood, aluminum, and steel substrates, offering versatility for marine, automotive, RV, and fabrication projects.
Key Features and Application Benefits
Modern fairing compounds come pre-thickened with fillers like phenolic microballoons and fumed silica, eliminating the guesswork of achieving the right consistency. These lightweight two-part marine epoxy fairing compounds are perfect for reshaping, filling, and fairing above and below the waterline on fiberglass, wood, aluminum, and steel. Color-coded components ensure complete mixing, while non-sagging formulas stay where you put them—even on overhead or vertical surfaces.
Premium formulations are specially designed for easy sanding and moisture resistance, creating a blush-free cured surface that won't gum sandpaper during finishing. This makes them ideal for everything from filling minor cosmetic defects to profiling large areas before primer application. Some compounds can fill up to one inch thick in a single coat without sagging, dramatically reducing the number of applications needed for deep repairs.
Top Brands in Fairing Compounds
When professional results matter, experienced boatbuilders and restorers turn to proven manufacturers. Awlgrip offers premium trowelable epoxy fillers like Awlfair LW, engineered for super-smooth finishes with easy sanding properties and suitable for use above or below the waterline. Interlux Paint delivers the Interfill 830 system, a professional-grade choice extensively tested for profiling steel, aluminum, and composite hulls with thick-build capability in a single coat.
Preparation and Finishing
Proper surface preparation is critical for fairing compound success. Surfaces must be clean, dry, and free of grease, oil, or wax. After application with trowels, spatulas, or putty knives, compounds typically cure within hours to overnight depending on temperature and formulation. Once cured, they sand smoothly to create the perfect substrate for primers, paints, gelcoat, or polyurethane finishes. For gelcoat applications, most fairing compounds require an epoxy barrier coat or surfacing primer as an intermediate layer to ensure proper curing.