• J-B Weld Fiberglass Putty is a fiberglass-reinforced, two-component putty system that provides waterproof, durable repairs to cracks up to ½ inch on fiberglass, composites, metal, and concrete.
• Provides short-strand reinforced repairs on fiberglass, composites, metal & concrete
• 2x the strength of body filler
• Dries in 30 minutes
• Easy to sand, paintable & waterproof