Retail sealers often have broader tolerances in solids content and fillers, less predictable cure time, and limited traceability compared with industrial grade emulsions shipped with COAs. They may be optimized for hand application, not calibrated spray bars, so viscosity can vary and cause streaking or uneven coverage on large projects. Cure behavior is more sensitive to humidity and temperature, increasing tracking risk under traffic. Contractors should also consider lower resistance to fuel or chemical spills, and limited compatibility data for overlays or interlayer bonding where failure is costly.