Superglue (CA) has a shelf life. Did you know that. We don't know, but we know the age of our glues. Mercury Adhesives is the ONLY superglue manufacturer with an unconditional guarantee! DESCRIPTION: Mercury M300M Instant is a medium viscosity cyanoacrylate developed for demanding high speed wicking applications. Excellent adhesion and cure speed on difficult to bond plastics and rubbers and contaminated or acidic surfaces. APPLICATIONS: High performance wicking and bonding of close-fitting parts incuding: plastics, rubbers, metal, wood, leather, fabric and composites to themselves or in various combinations.