A methacrylate adhesive provides a combination of high strength, fatigue endurance, impact resistance, and toughness. Developed for use on metal and other substrates, the MA820 two-part adhesive requires no primer and little or no surface preparation on most substrates. It takes the form of a low-odor, nonsagging gel with good tolerance to off-ratio mixing and offers a working time of 4–6 minutes. In 30–35 minutes, the gel achieves 75% of its ultimate strength. It cures with no surface tack. MA820, manufactured by ITW Plexus (Danvers, MA; 978/777-1100), can be used on stainless steel, aluminum, thermoplastics, and composites.