MavSeal HSU High-Solids Urethane Topcoat

Where MavSeal HSU Is Used

• Warehousing and manufacturing facilities
• Stadiums and other entertainment venues
• Educational and institutional facilities
• Aircraft hangars
• Automotive service bays
• Laboratories
• Hospitals and healthcare facilities
• Animal holding areas

Read Before Specifying

• Do not park vehicles on the coating within 36 hours of installation.
• MavSeal HSU is not designed for exterior use or immersion applications.
• MavSeal HSU should not be applied directly to concrete.
• Confirm product performance in the specific chemical environment prior to use.
• Prepare the substrate according to the surface preparation requirements.
• Do not apply to slabs on grade without a heavy, unruptured vapor barrier, or where moisture / MVT is present.
• For industrial/commercial use. Installation by trained personnel only.
• Do not allow materials to freeze.

Substrate Requirements

Apply only to clean, dry, and sound concrete that is free of coatings, sealers, curing compounds, oils, greases and any other contaminants that may affect adhesion. New concrete should be cured a minimum of 28 days (for green concrete, see MavPrime MVT). Contaminated concrete must be neutralized or removed, and any laitance or weak surface layers removed. Concrete must have a minimum surface tensile strength of 300 psi per ASTM D4541 and be mechanically prepared to a CSP 3 – CSP 5 profile per ICRI Guideline 310.2R (equal to 60-grit sandpaper or coarser). Address all surface irregularities, cracks, expansion joints and control joints before application. Do not apply to slabs on grade unless a heavy, unruptured vapor barrier is under the slab; moisture vapor transmission must be 3 lbs. or less per 1,000 sq. ft. in 24 hours per ASTM F1869 and in-situ relative humidity below 75% per ASTM F2170. Because some concrete outgasses, apply primer and coating while the substrate temperature is dropping (typically evening); double priming greatly reduces outgassing. MavSeal HSU should not be applied directly to concrete; install over a primer or as a topcoat over another Maverick system.

Mixing and Installation

Apply with air temperatures of 50° – 85°F (10° – 29°C), a floor temperature at least 5°F above the dew point, and material stored at 65° – 80°F (18° – 27°C); higher temperatures shorten pot life and working time. When topcoating a MavCoat epoxy, apply within 24 hours of the epoxy installation; after 24 hours, sand the coating with 100-grit or finer pads and wipe with a 50:50 mixture of water and isopropanol, then proceed once the cleaner has flashed. If pigmenting, blend MavTints with Part B before adding Part A, then mix Part A into Part B with a Jiffy-type mixer at medium speed. Pour the material into a roller pan and apply by dip and roll at 3 – 5 mils WFT using 1/4" or 1/8" nap rollers; the coating may foam at greater film thickness. To minimize lap lines in the finish coat, immediately cross-roll at a uniform 90° angle to the initial pass, using 18" rollers whenever possible. Pot life is 60 minutes at 77°F.

Full step-by-step instructions, pot life and recoat windows are in the MavSeal HSU product data sheet. Maverick installs MavSeal HSU with its own crews.