SB-112 is a two part epoxy system that excels as a primer/tie coat for polyester resin materials. SB-112’s surface does not inhibit the curing of the polyester resin at the interface. What results is an exceptional bond between the epoxy and polyester resin systems. FEATURES • Features a convenient 2:1 mixing ratio• Solvent Free• Ideal for polyester gelcoat repair• Blush Free• Grain Sealer for wooden musical instruments RECOMMENDED USES SB-112 is specially formulated for use in building and repairing sail and surfboards over polystyrene cores. It can also be used for coating and composite laminating.SB-112 is unique in that polyester resins and gel coats may be bonded to it without the use of "tie-coats". We recommend that polyester be bonded onto freshly sanded SB-112 epoxy within 48 hours of cure. Data Sheets Technical Data Sheets Safety Data Sheets