Sika SikaBiresin® CH72-2 Medium Cure - Pale Amber - Quart

The Sika SikaBiresin® CH72-2 Medium Cure epoxy resin system in pale amber is a professional-grade composite lamination resin engineered for high-performance marine construction. This quart-size unit delivers the ideal cure speed for wet layup, vacuum-bagging, and infusion processes on boats, marine components, and composite tooling where work time and throughput need to be balanced with handling efficiency.

The CH72-2 medium-cure formulation sits between fast and slow hardener options, making it practical for larger surface areas and complex layups that require extended working window without sacrificing demold time. Low viscosity enables excellent wet-out of fiberglass and carbon fiber fabrics, reducing air entrapment and voids—critical factors in structural integrity of hulls and load-bearing marine parts. The pale amber color provides visibility during application while curing to a clear finish that won't yellow or cloud marine epoxy joints over time.

Sika resin systems are standard in commercial marine manufacturing and repair shops because they balance processing ease with reliable mechanical properties in saltwater and UV-exposed environments. The CH72-2 is suited for builders and repair technicians working on fishing vessels, recreational boatbuilding, composite armor applications, and prototype tooling where temperature and humidity conditions demand predictable gel times and consistent part quality.

Use SikaBiresin® CH72-2 with the corresponding hardener (sold separately) and follow Sika's technical guidance for proper mixing ratios, pot life, and cure conditions. Temperature, humidity, and substrate preparation directly affect curing performance and final mechanical properties.