MavCrete UM-SL Self-Leveling Urethane Cement

Substrate Requirements

Surfaces must be sound, clean, dry and free of dirt, dust, grease, oil, silicones and other contaminants that may affect adhesion; scrub with detergent, rinse clean, and remove paint or coatings. New concrete should be cured a minimum of 14 days and reach a minimum 3,500 psi compressive strength, with a minimum pull-off strength of 300 PSI per ASTM D4541; early curing movement, shrinkage or cracking will reflect through the floor. Remove laitance and weak surface layers including broom-finished surfaces, and mechanically prep floors to CSP 3-5 per ICRI guideline (a profile equal to 40-grit sandpaper or coarser); diamond grind walls to CSP-3 per SSPC-SP13/NACE 6 or ICRI 310.2, and sand (do not grind) cement board walls. Vacuum all debris. Sawcut and key in all termination points at doorways, joints, drains, dock plates and high-impact areas with keyways at least 5/16" wide x 5/16" deep. Skim-coat cracks, holes and spalled areas with MavCrete UM-SL; areas deeper than 1/4" need a cementitious patch. Honor isolation, expansion and movable joints with the appropriate joint material after installation. Air and surface temperatures 40° – 85°F, material 60° – 80°F.

Mixing and Installation

Use a proper mixer and paddle (a MAN-U-FAB M-61 1 HP mixer with a 10 gallon pail and TR4-10 mixing arm is listed) to ensure a complete mix without excessive air. With the mixer running, pour in 1/2 gallon Part-A, add 1 bag of MavTints pigment and mix about 15 seconds, add 1/2 gallon Part-B and mix another 15 seconds, then gradually add the full MavCrete UM-SL Filler bag and blend until all particles are wetted out, normally about two minutes. Within 3 minutes, spread the slurry with a cam rake or trowel at approximately 3/16" for a 1/4" finished floor, laying abutting edges within 10 minutes and keeping a wet edge on large placements. Back-roll with a spike roller to settle the filler and blend rake lines, then roll with a loop/texture roller perpendicular to the rake lines before broadcasting to rejection with Colored Quartz at approximately 6 sq. ft./lb. until no wet areas remain. After roughly 6-8 hours, vacuum excess quartz and gently scrape any loosely bonded particles, then lock the system with the MavSeal UPA Slow Cure topcoat mixed 1:1 by volume and applied by flat or notched EPDM squeegee at 100 – 134 sq. ft. per gallon (12 – 16 mils wet), back-rolled with a non-shed 3/8" roller; a second 6 – 8 mil coat within 24 hours reduces texture. Below 60°F use MavSeal UPA Fast Cure. An optional cove base is installed over a primed wall with the system's urethane cove base material, trowelled to 1/8"-3/16" and finished with a cove trowel. Installation is for trained persons experienced in polyurethane concrete flooring.

Full step-by-step instructions, pot life and recoat windows are in the MavCrete UM-SL system guide. Maverick installs MavCrete UM-SL with its own crews.