Achieve Smooth, Professional Caulk Lines with Unsanded Precision

MAPEI Keracaulk U is a premium, unsanded siliconized acrylic caulk designed to deliver clean, smooth joints in tile and stone installations. Its fine texture makes it ideal for narrow joints and changes of plane where a sleek, uniform finish is essential.

Available in select colors to match all MAPEI grout shades, Keracaulk U ensures seamless integration with surrounding grout lines—helping contractors and homeowners achieve a cohesive, professional look.

Color-Matched Finish That Blends Perfectly with MAPEI Grouts

Consistency in color is critical in high-visibility areas such as backsplashes, showers and countertops. Keracaulk U is formulated to coordinate with MAPEI’s grout color palette, reducing visual inconsistencies between grout joints and movement joints.

This makes it ideal for:

• Changes of plane in tiled walls

• Perimeter joints along tubs and showers

• Backsplashes and countertops

• Interior residential and light commercial applications

The result is a polished finish that enhances the overall tile installation.

Built-In Mold and Mildew Resistance for Cleaner Surfaces

Keracaulk U features BioBlock® technology, which helps protect the cured caulk from mold and mildew growth. This added layer of protection is especially valuable in moisture-prone environments such as bathrooms and kitchens.

By resisting mold and mildew, the caulk helps maintain a cleaner appearance over time while supporting the longevity of the installation.

Easy Application with Gun-Grade Tubes and Water Cleanup

Designed for convenience, Keracaulk U comes packaged in gun-grade tubes for smooth, controlled dispensing. Its workable consistency allows for easy tooling, making it suitable for both professionals and DIY users.

Key application benefits:

• Easy-to-apply gun-grade formula

• Water cleanup while fresh

• Smooth tooling for clean joint lines

• Low odor and VOC-compliant formulation

These features simplify installation and reduce cleanup time on the jobsite.