Mor-Flexx Mortar & Stucco Repair Caulk (Gray) is the go-to solution for permanent, weatherproof repairs in mortar, stucco and grout. Unlike rigid patching compounds that dry hard and crack, Mor-Flexx remains elastic—stretching and compressing with temperature changes and structural movement. Its sandy, mortar-like texture blends seamlessly into existing masonry surfaces, and it’s fully paintable once cured. Packaged in a standard 10.5 oz cartridge, Mor-Flexx makes grout joint and stucco patching fast, clean and virtually invisible.

Key Features

• Scope of use

• Repair crumbling mortar joints, cracked stucco or textured walls

• Ideal for brick, block, stone, concrete foundation walls, EIFS and more

• Bonds to masonry, metal, wood and other building materials

• Easy application

• Cartridge fits into any caulking gun—no mixing or bulky tools

• Smooths out effortlessly, tools cleanly with a damp finger or tool

• Cleans up with soap and water before curing

• Long-term performance

• Elastomeric acrylic latex formula stays flexible for years

• Resists UV, rain, freeze-thaw cycles and everyday wear

• Won’t crack, fall away or shrink back into the joint

• Finish and paintability

• Textured finish mimics surrounding mortar

• Dries tack-free in minutes; fully cured in 24 hours

• Accepts most latex and masonry paints for color matching

⚠️ WARNING: This product can expose you to Ethyl acrylate known to the State of California to cause cancer and Ethylene glycol (ingested) known to cause birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.