Fillers

Fiberglass Fillers – Fairing Compounds, Q-Cell, Aerosil & Putties

Get professional results with our full range of fiberglass fillers and fairing compounds. From Adtech 14 structural filler and Radius Putty to Q-Cell microballoons and Aerosil thickeners, Fiberglass Florida has the materials to modify resin viscosity, fill voids, create bonding compounds, and smooth surfaces. Ideal for boat repairs, mold building, surfboard shaping, and custom laminating projects.

What is Aerosil used for?

Aerosil is a fine powder used to thicken resin and prevent it from running or sagging. It is commonly added to bonding mixtures, repair pastes and fillets.

What are Milled Fibers used for?

Milled fibers are short fiberglass strands mixed with resin to create a stronger, reinforced repair compound. They are commonly used for filling small gaps, chips, holes, joints and damaged fiberglass areas.

How do I catalyze and use F206 LF/LM Fairing Compound, and what’s the working time?

Catalyze F 206 LF/LM with MEKP at about 1% at 77°F (25°C) (keep within 1–2%). Expect gel time of 3–6 min for LF and 8–12 min for LM (100 g mass). Adjust MEKP for temperature (slightly more in cooler temps, less when warmer). Do not use below 65°F (18°C). The LM version has a color indicator to confirm a thorough mix. Apply with a spatula/trowel; allow to cure fully before sanding. Use PPE and good ventilation.

Which Adtech (now Sika) filler should I use—P-11 (AP112), P-14, P-17, or P-77?

P-14 – Best all-around marine filler and top seller; fast set, easy sanding, bonds to fiberglass, metals, and more. P-11 / AP112 – Fiber-filled bond & fill; strong adhesion for deep repairs before fairing. P-17 – High-heat filler; handles up to ~446°F for tooling or engine areas. P-77 / AP077 – Styrene-free, easy-sanding filler; heat resistant to ~392°F.

What filler should I use for a fiberglass repair?

Use Aerosil to thicken resin, Q-Cell for lightweight fairing, milled fibers or chopped strand for added reinforcement, bonding putty for joining parts, and fairing putty for smoothing surfaces. The correct choice depends on whether the repair requires strength, bonding or easy sanding.

Fillers

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Fiberglass Fillers – Fairing Compounds, Q-Cell, Aerosil & Putties