Water-based liquid polyurethane


The MARITHAN® is a liquid-applied, highly permanent elastic, cold applied and cold curing, water based, one component, modified polyurethane membrane used for long-lasting waterproofing.

When the MARITHAN® is applied, it forms a hydrophobic, 100% waterproofing, permanent elastic, seamless membrane without joints or leak possibilities, that protect old and new structures efficient and on a long term basis.

The MARITHAN® is based on the innovative PUD-Technology of MARIS POLYMERS SA.


  • Simple application (roller or airless spray)
  • When applied forms seamless membrane without joints.
  • UV stable
  • Suitable for exposed surfaces.
  • Resistant to water
  • Resistant to frost.
  • Maintains its mechanical properties over a temperature span of -20C to +80C.
  • Provides water vapor permeability
  • Full surface adherence without any additional anchoring.
  • The waterproofed surface can be walked on (domestic use).
  • Even if the membrane gets damaged, it can be easily repaired locally within minutes.
  • Low cost


  • Waterproofing of Roofs
  • Waterproofing of Balconies and Terraces
  • Waterproofing of Decks
  • Waterproofing of Wet-Areas (under tile)
  • Waterproofing and protection of Concrete constructions.
  • Waterproofing and Protection of Drywall and Cement-boards
  • Protection of Polyurethane Foam Insulation


1– 1,5 kg/m2 applied in two or three layers. This coverage is based on application by roller onto a smooth surface in optimum conditions. Factors like surface porosity, temperature and application method can alter consumption.


The MARITHAN® is supplied in white, grey and terracotta red.

PUD Technology™: The Green revolution in Polyurethane

The MARITHAN® is based on the innovative PUD Technology™ of MARIS POLYMERSSA, which enables, long-chain polyurethane macromolecules to be incorparated in a water medium, forming stable dispersions.

The PUD Technology™ based products, have the advantage that they offer the high level properties of solvent based products, in an ecological, consumer and evironmentally friendly, water-based, low VOC,no ADR transport product.

The PUD Technology™ is the entry to the Green revolution in Polyurethane based products.

Technical data

PROPERTY RESULTS TEST METHOD Elongation at Break >500 % ASTMD 412 Tensile Strength >1,5 N/ mm 2 ASTMD 412

Water Vapor Permeability >15 gr/m2/day ISO 9932:91 Resistance to Water Pressure No Leak (1m water column, 24h) DIN EN 1928 Adhesion to concrete >1,2 N/mm 2 ASTMD 903 Hardness (Shore A Scale) 60 ASTMD 2240 (15”) Tack Free Time 6 hours Conditions: 20C, 50% RH Light Pedestrian Traffic Time 18 hours Conditions: 20C, 50% RH Final Curing time 7 days Conditions: 20C, 50% RH


Surface Preparation

Careful surface preparation is essential for optimum finish and durability. The surface needs to be clean, dry and sound, free of any contamination, which may harmfully affect the adhesion of the membrane. Maximum moisture content should not exceed 8%. Substrate compressive strength should be at least 25MPa, cohesive bond strength at least 1.5MPa. New concrete structures need to dry for at least 28 days. Old, loose coatings, dirt, fats, oils, organic substances and dust need to be removed by a grinding machine. Possible surface irregularities need to be smoothened. Any loose surface pieces and grinding dust need to be thoroughly removed.

Repair of cracks and joints:

The careful sealing of existing cracks and joints before the application is extremely important for long lasting waterproofing results.

  • Clean concrete cracks, hairline cracks and joints of dust, residue or other contamination. Fill all prepared cracks and joints with MARIFLEX® PU 30 sealant. Then apply a layer of MARITHAN® , 200mm wide centered over all cracks and while wet, cover with a correct cut stripe of the MARISEAL® FABRIC. Press it to soak. Then saturate the MARISEAL® FABRIC with enough MARITHAN® until it is fully covered. Allow to cure


Prime absorbent and brittle surfaces like concrete, cement screed, mortar, plaster, wood with MARITHAN® diluted with 10-20%cleanwater primer. For very brittle surfaces and/or demanding applications prime with MARITHAN® PRIMER PU or MARITHAN®PRIMEREP. Allow the primer coat to cure.

Waterproofing Membrane

Stir well before using. Poor the MARITHAN® onto the prepared / primed surface and lay it out by roller or brush, until all surface is covered. You can use airless spray allowing a considerable saving of manpower.
After 6-24 hours apply another layer of the MARITHAN®. For demanding applications and better waterproofing results apply a third layer of the MARITHAN®.

Reinforce always with the MARISEAL® FABRIC at problem areas, like wall-floor connections, chimneys, pipes, waterspouts (siphon), etc. In order to do that, apply on the still wet MARITHAN® a correct cut piece of MARISEAL® FABRIC, press it to soak, and saturate again with enough MARITHAN®. For detailed application instructions with the MARISEAL® FABRIC, contact our R+D department.

ATTENTION: Do not apply the MARITHAN® over 0.5 mm thickness (dry film) per layer.

WARNING: Do not apply the MARITHAN® in negative (degC) temperatures or when rain or frost is imminent in the next 48 hours. For best results, the temperature during application and cure should be between 5oC and 35OC. Low temperatures retard cure while high temperature speed up curing. High humidity may affect the final finish.

WARNING: The MARITHAN® is slippery when wet. In order to avoid slipperiness during wet days, sprinkle suitable aggregates onto the still wet coating to create an anti-slip surface. Please contact our R+D Dept. for more details.

MARITHAN® pails should be stored in dry and cool rooms for up to 18 months. Protect the material against frost and direct sunlight. Storage temperature: 50-300C. Products should remain in their original, unopened containers, bearing the manufacturers name, product designation, batch number and application precaution labels.




Marithan is a liquid-applied,highly permanent elastic, cold-applied and cold curing, water-based, one component modified polyurethane membrane.

20L – 28cm x 28cm x 36cm

1-1.5kg per sq m applied in two or three layers

No of Coats:
2 coat application

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