Cab-O-Sil Fumed Silica Thickener

2026-03-13T21:55:07-07:00

Type: Cab-o-sil
Price: 6.00 - 115.00 (4 variants)

For high-strength repairs and structural bonding, Cab-O-Sil is the industry's highest-quality brand of fumed silica. Proudly made in the USA, this thickening agent is essential for shapers and glassers who require a resin paste with superior flex characteristics and durability.

Unlike microspheres, Cab-O-Sil creates a "thixotropic" paste that is incredibly strong and resistant to cracking under stress. It is 100% compatible with both polyester and epoxy resins. Because it cures translucent, it is the ideal base for custom color work; simply add pigments to achieve a perfect white or matched color effect for your repair.

Key Features:

High Flexural Strength: Offers superior flex and impact resistance compared to Q-Cel.

Universal Compatibility: Works seamlessly with all surfboard resin systems (Epoxy & Poly).

Non-Sag Formula: Excellent for vertical surfaces and rail repairs where you need the resin to stay put.

Translucent Base: Cures clear/cloudy—perfect for mixing with pigments for color-matched repairs.

Pro Tip: Cab-O-Sil is much harder to sand than Q-Cel. Use it for the structural "meat" of a repair, but leave a small amount of room to cap it with a Q-Cel/Resin mixture for a much easier final sanding process.