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Stanley All Purpose RTV Silicone Sealant — Gray (S421 Series)

Stanley All Purpose RTV Silicone is a one-component, acetoxy-cure silicone sealant for general sealing and glazing. It cures at room temperature to a permanently elastic, 100% waterproof rubber that resists mold, mildew, aging, cracking, and discoloration, and stays flexible through temperature extremes. This is the gray color in a 10.1 fl oz cartridge.

PropertyDetail
BrandStanley (S421 Series)
Product TypeOne-component acetoxy-cure RTV silicone sealant
ColorGray
CureRoom-temperature acetoxy cure (moisture-cure)
AdhesionGlass, ceramics, metals, plastics, and common non-porous building materials
Key properties100% waterproof, permanently elastic, mold/mildew resistant, resists aging, cracking & discoloring
StorageStore between +41°F and +77°F (+5°C to +25°C)
Cartridge size10.1 fl oz
  • Advanced acetoxy-cure chemistry for a quick set and a strong, durable bond.
  • 100% waterproof and permanently flexible after cure — ideal for wet areas.
  • Antibacterial / mold- and mildew-resistant film that will not yellow or crack.
  • Excellent adhesion to glass, ceramic, metal, and plastic.
  • Stays elastic through low and high service temperatures.

Sealing and glazing around windows, doors, plumbing fixtures, kitchens and bathrooms; connection and expansion joints on glass, porcelain, and steel; general DIY and professional interior/exterior sealing on non-porous substrates.

Wear appropriate PPE. Follow manufacturer instructions and safety regulations.