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    Waterproofing

    Hydrothane WP2 Plus two part cold applied polyurea waterproofing membrane by MATEX

    Hydrothane Wp2 Plus

    Elastomeric Two Part Cold Applied Polyurea Waterproofing Membrane

    HYDROTHANE WP2 PLUS is a solvented, two-component, cold-applied elastomeric waterproofing membrane based on advanced polyurea resins, engineered for exceptional elasticity and durability. Free from coal tar, HYDROTHANE WP2 PLUS cures to form a high-density, seamless, continuous membrane offering outstanding chemical resistance and mechanical performance. It is ideal for waterproofing building structures such as foundations, kitchens, toilets, industrial wet areas, and for use as an intermediate waterproofing layer in car park systems. The product features fast chemical curing, high tensile strength and elongation, crack bridging capabilities, excellent adhesion to both new and existing substrates, and robust resistance to corrosion, mildew, frost, and harsh cleaning chemicals.

    Technical data:
    • Color : white or grey liquid coating
    • Touch dry : >2 hours
    • Full dry : 3-4 hours
    • Application Temperature : 5°C to 40°C
    • Coverage : 1.0 liter per 1m² @ 1mm thickness
    • Packaging : 4 & 15 lit kit
    Related Documents:

    How to Apply Hydrothane Wp2 Plus

    Hydrothane WP2 Plus is mixed on site and applied cold by brush, roller or airless spray in two coats over a prepared, pretreated substrate.

    1. Prepare the surface. The surface should be sound, clean, dry and free from loose and flaking material, efflorescence, laitance, curing compounds, dirt, oil, rust and grease. Concrete should be cured for at least 28 days with moisture content below 5%; use grinding or grit/captive blasting for deep contamination or old surfaces. Metal should be blasted or mechanically prepared to bright steel and coated directly.
    2. Pretreat cracks, corners and joints. Fill non-moving cracks under 1.0 mm with a 1.0 mm thick strip of Hydrothane WP2 Plus extending 50 mm each side. Form coving fillets at parapets and columns with Lavarep F40 and apply a 1 mm reinforcing strip extending 100 mm each side. Seal expansion joints with Megaseal PU1, then apply a 200 mm strip centered over the joint with fiber mesh embedded and overcoated.
    3. Prime porous substrates. On porous substrates, apply a rich coat of Armoprime EP100 to improve mechanical adhesion between the coating and the substrate.
    4. Mix. Mix component A (base) with a low-speed mixer for one minute, slowly add part B (hardener) and mix with a suitable paddle for 3–4 minutes to a homogeneous, lump-free mix. Leave for 2 minutes to release entrapped air; mixing is exothermic, so do not mix more than can be used within the 20–25 minute pot life.
    5. Apply two coats. Apply the first coat at 2.0 m²/liter/coat. Apply the second coat once the first is completely dry, at the same rate, preferably at 90 degrees; in below ground structures, wet areas and roofs the minimum thickness should not be less than 1.2 mm. Avoid excessive film thickness in a single layer, which can cause bubbles.
    6. Detail penetrations. In wet areas, apply an additional strip of product around pipes and conduits.
    7. Protect and top. Do not leave the membrane exposed for long periods; apply protection sheets. If it will be fully exposed to sun and atmosphere, apply Hydrothane A100 as a protective layer after curing. In car park systems, broadcast quartz to improve grip for subsequent polyurethane layers.
    8. Test and clean. Run water tests only after full cure (minimum 7 days). Clean tools with Armosolvent before the product hardens.

    Summary of the method in the Hydrothane Wp2 Plus Technical Data Sheet. Always follow the full TDS on site.

    Standards & Test Methods

    StandardTitleReferenced for
    ASTM C836Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing CourseCrack bridging (up to 2 mm, no effect)
    ASTM D412Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—TensionTensile strength (>7 N/mm²) and elongation (>700%)
    ASTM D4541Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion TestersAdhesion to concrete (>2.0 N/mm²)
    ASTM D2240Standard Test Method for Rubber Property—Durometer HardnessShore A hardness (65)
    ASTM E96Standard Test Methods for Water Vapor Transmission of MaterialsWater vapor transmission (0.3 g/h/m²)
    ASTM D624Standard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic ElastomersTear strength – listed in TDS, no value given

    Standards and test methods as referenced in the Hydrothane Wp2 Plus Technical Data Sheet. Values in the TDS are typical laboratory results under standard conditions.

    Frequently Asked Questions

    What is the coverage of Hydrothane WP2 Plus?

    Coverage is 1.0 liter per m² at 1.0 mm thickness. Each coat is applied at 2.0 m² per liter, and below ground structures, wet areas and roofs need a minimum of 1.2 mm.

    What is the pot life and drying time of Hydrothane WP2 Plus?

    Pot life is 20–25 minutes at 25°C. Touch dry is >2 hours and full dry is 3–4 hours; water tests should be run only after full cure, minimum 7 days.

    Can Hydrothane WP2 Plus be left exposed on a roof?

    The TDS states it is not designed to be exposed in external applications. Where it will be fully exposed to sun and atmosphere, apply Hydrothane A100 as a protective layer on top after curing.

    What temperature can Hydrothane WP2 Plus be applied at?

    The application/service temperature is +5°C to +40°C. It should not be applied below 5°C, with imminent rain, or on surfaces with a risk of rising dampness.

    Can Hydrothane WP2 Plus be used in car parks?

    Yes. It can be used as an intermediate waterproofing membrane in car park deck systems; broadcasting quartz improves the grip of subsequent polyurethane layers, but reduces flexibility.

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