Description
LANCO | Ultrathane WB Urethane Acrylic Sealant 10-oz Tube (Ultra White)
LANCO – Ultrathane-WB is a water-based acrylic sealant modified with urethane, of good adhesion and performance. For sealing joints and seams with up to 50% total joints movement! Lanco Ultrathane WB offers the best adhesion and flexibility in a water based formulation. It will not crack, crumble, or peel even when exposed to severe weather or total joint movement. Lanco Ultrathane WB produces a mildew resistant seal. Used as an interior / exterior urethane sealant to seal cracks or joints in or between concrete, masonry, wood, metal, glass, drywall, plaster, ceramics, and many plastics. Use on windows, doors, pipes, ducts, foundations, trim, siding, and chimneys. It seals out moisture, air, dust, dirt and noise.
24 Tubes Per case.
• Meets ASTM C-834, C-920 Type C, Class A, Type II
• Paintable in 4 hours!
• Cleans up with Soap and Water
• Commonly used in the siding, window & door industry
• Excellent adhesion to most common building substrates
• Ultra Flexible, Ultra Adhesion, UV-Resistant, Mildew Resistant, and will not crack, crumble, or peel
• Non-Hazardous, Non-Flammable, Non-Toxic
• Low VOC formulation, Low Odor
• Bonds to; concrete, masonry, wood, metal, glass, drywall, plaster, ceramics, and many plastics
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To download the most recent Technical Data Sheet, please click here.




One part, Urethane Acrylic Emulsion Sealant and Adhesive. Non-Hazardous, Non-Flammable. It will not crack, crumble, or peel, and is Mildew Resistant.

