Unsanded Siliconized Acrylic Caulk

Mapei Keracaulk U (unsanded) is a premium-grade, easy-to-use, easy-to-clean siliconized acrylic caulk formulated to match the color and texture of Mapei unsanded grouts.


  • Contains a mildewcide to make both caulks resistant to degradation from mildew (after cure)
  • Paintable
  • Water cleanup while fresh
  • Packaged in gun-grade tubes for easy application
  • VOC-compliant

Product Use

  • For gaps up to 1/4″ (6 mm)
  • As a flexible barrier/filler between horizontal and vertical surfaces to prevent cracked tile due to expansion
  • For filling joints where tile abuts dissimilar surfaces
  • For caulking around sinks, tubs, showers, countertops and ceramic tile floors
  • For interior use only
  • For restoring cracked or worn grout joints


  • Allow at least 4 to 6 hours drying time before painting.
  • Protect from water exposure until fully cured at least 72 hours.

**Note: Larger beads of caulk and cool, humid conditions will require a longer drying time.