Schönox MR 18 Moisture Mitigation & Substrate Solidifier

Schönox MR 18 is a professional-grade, one-component polyurethane moisture mitigation system engineered to address elevated moisture conditions in concrete substrates before the installation of flooring systems and underlayments. Available through 515 DCS, this ready-to-use solution provides contractors with a fast-curing, low-VOC moisture control system capable of handling moisture levels up to 99% RH and 18 lbs./1,000 sq. ft./24 hrs. MVER.

In addition to moisture mitigation, Schönox MR 18 serves as an effective substrate solidifier, strengthening and stabilizing challenging surfaces such as gypsum underlayments, wood substrates, and adhesive residue-contaminated concrete. Its rapid cure profile helps keep projects moving while creating a durable, moisture-resistant foundation for subsequent flooring installations.

Why Contractors Choose Schönox MR 18

Excess moisture is one of the leading causes of flooring failures, adhesive breakdown, and underlayment issues. Schönox MR 18 provides a reliable solution for moisture-sensitive projects while offering the added benefit of substrate reinforcement.

Contractors rely on MR 18 to:

• Mitigate moisture up to 99% RH
• Control moisture vapor emissions up to 18 lbs. MVER
• Strengthen weak or porous substrates
• Improve surface stability before leveling
• Accelerate project timelines with fast curing
• Create a moisture-resistant barrier beneath flooring systems
• Eliminate mixing and reduce installation errors

Moisture Mitigation Applications

One-Coat System

For unheated, moisture-resistant cement-based substrates with:

• Up to 93% Relative Humidity (RH)
• Up to 12 lbs. MVER

Schönox MR 18 can be applied as a single-coat moisture mitigation system before installing Schönox underlayments, resilient flooring, or wood flooring systems.

Two-Coat System

For elevated moisture conditions:

• Above 93% RH up to 99% RH
• Above 12 lbs. MVER up to 18 lbs. MVER

Schönox MR 18 is applied as a two-coat system in conjunction with Schönox Protect Adhesive to create a highly effective moisture control barrier.

Substrate Solidification Applications

Beyond moisture mitigation, Schönox MR 18 can be used as a one-coat substrate solidifier to strengthen and stabilize:

• Gypsum-based substrates
• Wood substrates
• Adhesive residue-contaminated surfaces
• Weak or porous concrete
• Existing flooring preparation surfaces

By creating a closed, reinforced film, MR 18 helps prepare problematic substrates for successful underlayment and flooring installations.

Key Features & Benefits

• One-component polyurethane system
• Ready-to-use formulation
• Fast drying and rapid curing
• Moisture mitigation up to 99% RH
• Controls moisture vapor emissions up to 18 lbs. MVER
• No mixing required
• Low VOC formulation
• Strengthens weak substrates
• Excellent substrate penetration
• Suitable for flooring and underlayment preparation
• Helps reduce flooring failure risks
• Interior applications
• Compatible with Schönox underlayment systems

Technical Specifications

Product Properties

• Chemistry: Polyurethane Resin
• Color: Yellow
• Density: 1.18 kg/L
• VOC Content: 0 g/L (Calculated, SCAQMD 1113)
• Storage Temperature: Minimum 41°F
• Working Temperature: Minimum 59°F

Coverage Rates

One-Coat System

• Up to 1,000 sq. ft. per 2.5-gallon container

Two-Coat System

• Up to 500 sq. ft. per 2.5-gallon container

Cure Times

• Second Coat Application: Approximately 1 hour
• Ready for Leveling After Final Coat: Approximately 1 hour
• Dry-to-touch cure between coats

Moisture Performance

• Up to 99% RH
• Up to 18 lbs./1,000 sq. ft./24 hrs. MVER
• Permeance (ASTM E96): ≤ 0.4 perm (two-coat system)

Sustainability & LEED Contributions

Schönox MR 18 supports sustainable construction initiatives and may contribute toward LEED v4.1 project certification in the following categories:

• Low-Emitting Materials (EQc2)
• Environmental Product Declaration (MRc2)
• Material Ingredients (MRc4)

Available from 515 DCS

As an authorized Schönox distributor, 515 DCS supplies contractors with high-performance moisture mitigation and substrate preparation solutions designed to reduce flooring failures and improve installation success. Whether you’re working with high-moisture concrete, gypsum underlayments, or challenging renovation substrates, Schönox MR 18 delivers the protection and reliability demanded by commercial and residential flooring professionals.