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Citadel Ultra-Hydro Stop Primer is a professional moisture-vapor-barrier (MVB) primer system designed for use on damp and green concrete prior to resinous floor coatings. The line includes two options to match project conditions: Ultra-Hydro Stop Primer, a two-component, 100% solids epoxy designed for high moisture mitigation, and Ultra-Hydro Stop H2O Primer, a three-component, water-based epoxy formulated for early-install schedules and low-odor applications.
Regular (100% solids): self-leveling, fast-setting epoxy primer that provides excellent adhesion and high moisture mitigation—when applied at the specified film build, it reduces vapor emission on moisture-laden slabs (meets ASTM F3010 requirements).
H2O (water-based): 50%-solids epoxy primer for moisture control with excellent adhesion to damp concrete; can be applied as early as 48 hours after placement to help reduce job-site downtime.
MVB primer over damp or green concrete prior to epoxy, polyurethane, or polyurea systems (follow approved system guidance).
Projects requiring strong adhesion and a reliable base for decorative broadcast or high-build systems.
Accelerated timelines / early installs: use H2O variant for low-odor, water-based application and placement as early as ~48 hours after concrete pour (see TDS).
High moisture mitigation: use Regular variant where increased moisture vapor transmission (MVT) reduction is required (meets ASTM F3010 when installed to spec).
Commercial, industrial, and residential substrates where moisture-sensitive coverings or resinous topcoats are planned.
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