TotalBoat Polyester Fairing Compound Quart Kit — fast-curing trowelable marine filler, sandable finish

Whether you’re smoothing minor gelcoat blemishes or evening out surface imperfections on composite parts, this quart kit provides a buttery, trowelable paste that mixes with the included MEKP catalyst and cures to a hard, sandable finish in as little as 20–30 minutes at 77°F. The product is formulated for cosmetic fairing—minimal shrinkage, easy feathering, and low odor make it a practical choice for boaters, repair shops and mold builders who need quick turnaround before priming or re-gelcoating.

How quickly will this fairing compound cure and become sandable?

At a typical shop temperature (77°F), mixed Polyester Fairing Compound begins to set rapidly, reaching a hard, sandable state in roughly 20–30 minutes when mixed with the recommended MEKP amount. Working time is short—plan small sections or use rapid application techniques.

• Mix ratio: add 14–16 drops of MEKP per ounce of compound at 77°F for 10–15 minutes working time.
• Cures to sanding hardness in about 20–30 minutes at recommended conditions.
• Minimal shrinkage reduces the need for re-filling after cure.

What surfaces and repairs is this fairing compound best suited for?

This polyester fairing filler is engineered for cosmetic surface work on gelcoat, fiberglass and other composite surfaces above the waterline. It’s ideal for filling print-through, hairline spider cracks, pinholes and sanding marks, but it’s not intended as a structural repair on deep gouges.

• Designed for finishing and fairing—use after structural repair putties for deep damage.
• Works on boat hulls, decks, small molds, and fiberglass parts.
• Can be tinted with polyester-safe colorants to better match surrounding gelcoat.

How do I apply and sand the compound to get a smooth feathered finish?

The compound’s thick, creamy consistency spreads smoothly with a trowel or spreader and holds on vertical surfaces without sagging, which helps you build uniform feather edges. Once cured, it sands easily using progressively finer grits to achieve a pinhole-free base ready for primer, paint or gelcoat.

• Apply with a clean trowel or spreader; feather edges thinly toward surrounding surface.
• Sanding requires fewer grit changes due to the compound’s easy-cut characteristic.
• For deep repairs, fill structurally first with TotalBoat Polyester Structural Repair Putty, then topcoat with this fairing compound.

Are there special considerations for below-the-waterline use or safety tips?

Polyester Fairing Compound is formulated for above-waterline cosmetic work; if used below the waterline it must be overcoated with an approved epoxy barrier coat to prevent water ingress and adhesion issues. Always follow MEKP handling precautions and work in a well-ventilated area while wearing appropriate PPE.

• Not recommended as a stand-alone below-waterline repair—use epoxy barrier when needed.
• Includes MEKP catalyst; store and use per safety data sheet instructions.
• Less odor than many polyesters, but still use ventilation and protective gloves.

Who is this for: TotalBoat Polyester Fairing Compound Quart Kit is aimed at boat owners, professional marine repair technicians, and composite fabricators who need a fast-setting, easy-to-sand fairing material for above-waterline cosmetic repairs and mold finishing. If you require structural rebuilding, pair this compound with a high-strength structural putty first; for quick, high-quality surface finishing and minimal rework, this kit is a practical, USA-made choice.

Features:

• Premium marine-grade 2-part polyester fairing filler for cosmetic gelcoat and fiberglass repairs.
• Buttery consistency spreads smoothly and resists sag on vertical surfaces.
• Fast cure and easy sanding—works in 20–30 minutes at 77°F with minimal shrinkage.
• Versatile uses: fairing hulls, decks, molds and composite parts; tintable with polyester-safe dyes.
• Available as quart kit or gallon kit; each kit includes MEKP catalyst.