LOCTITE SpeedSeal RTV Silicone Adhesive Sealant

LOCTITE SpeedSeal is a 1-component, fast-dry RTV silicone that withstands water contact just 2 hours after application. This 100% silicone rubber sealant replaces traditional sealants that require a minimum 24 hours prior to water exposure. Resistant to mold and mildew, this product features a flexible, watertight seal that provides a time-saving, back-in-service option.


  • 100% silicone formulation – no fillers
  • Withstands water contact within 2 hours of application
  • Creates a watertight, mold- and mildew-resistant seal
  • A “0” antimicrobial rating as tested per EN ISO 846
  • Withstands temperature extremes of -30°F to 250°F
  • Highly resistant to ultraviolet light and other environmental elements


Forms a weatherproof bond to materials like glass, ceramic, aluminum, primed steel and some plastics. Typical applications include:

  • Sealing bathtubs, sinks, fixtures, showers, etc.
  • Applications where mildew is problematic

Additional Documents

LOCTITE Superflex SpeedSeal Sell Sheet

Product information

IDH# Item Name Size
Case Quantity
Material Safety Data Sheets
1311327 1311327 Loctite® SpeedSeal™ Clear
300 ml cartridge
12 / case
1312042 1312042 Loctite® SpeedSeal™ White
300 ml cartridge
12 / case