Sika SikaBiresin AP112 Fibrous Filler Compound

Sika SikaBiresin® AP112 is a fibrous filler that provides increased bonding strength for rebuilding broken or void areas in SMC, RIM, and other thermoset composites. It is designed for fabricators who need deeper surface composite repairs before final surfacing with a fairing compound.

The smooth thixotropic paste system mixes easily and applies with stable, predictable results, in varying degrees of thickness with minimal shrinkage. It's suited to bonding FRP composites, rebuilding broken areas, metal inserts to fiberglass, marine fabrication, metal to concrete, wood to wood, and metal to metal bonding. Requires BPO hardener, sold separately. Browse more options in our cleaning, detailing, and protection category.

Key Features

• Fibrous filler adds bonding strength beyond a standard filler paste.
• Rebuilds broken or void areas without needing a separate reinforcement layer.
• Thixotropic paste mixes and applies easily without sagging on vertical surfaces.
• Minimal shrinkage keeps repairs from cracking or pulling away as it cures.
• No bleed out keeps the repair contained to where you apply it.
• High impact strength holds up to the same stresses as the surrounding structure.

Frequently Asked Questions

Does this require a hardener? Yes, BPO hardener is required and sold separately.

What is this compound used for? Rebuilding broken or void areas in SMC, RIM, and other thermoset composites before final fairing.

What bonding applications does this suit? FRP composites, metal inserts to fiberglass, marine fabrication, metal to concrete, and wood or metal bonding.