Solvent-based, liquid-applied polyurethane membrane


MARISEAL 250 is a premium, liquid-applied, highly permanent elastic, cold applied and cold curing, one component polyurethane membrane used for long-lasting waterproofing.

The MARISEAL 250 is based on pure elastomeric hydrophobic polyurethane resins, which result in excellent mechanical, chemical, thermal, UV and natural element resistance properties.

Cures by reaction with ground and air moisture.


  • Simple application (roller or airless spray)
  • When applied forms seamless membrane without joints
  • Resistant to water.
  • Resistant to frost.
  • Resistant to root penetration, so it can be used in green roofs
  • Crack-bridging up to 2mm, even at -10C
  • Provides water vapor permeability, so the surface can breathe
  • Provides excellent thermal resistance, it never turns soft.
  • Provides excellent weather and UV resistance
  • Waterproofs old bitumen-, asphalt felts by covering them, without the need to remove them prior to application
  • Provides high sun reflectivity, contributing to thermoinsulation.
  • Maintains its mechanical properties over a temperature span of -40C to +90C
  • Provides excellent adhesion to almost any type of surface
  • The waterproofed surface can be used for domestic and public pedestrian and vehicular traffic.
  • Resistant to detergents, oils, seawater and domestic chemicals.
  • Even if the membrane gets mechanically damaged, it canbeeasily repaired locally within minutes.
  • Does not need the use of open flames (torch) during application
  • Over 15 years of positive feedback worldwide.


  • Waterproofing of Roofs
  • Waterproofing of Balconies, Terraces and Verandas
  • Waterproofing of Wet Areas (under-tile) in Bathrooms, Kitchens, Balconies, Auxiliary Rooms, etc
  • Waterproofing of Pedestrian and Vehicular traffic Decks
  • Waterproofing of Green Roofs, Flowerbeds, Planter Boxes
  • Waterproofing of old Bitumen felts, Asphalt felts, EPDM and PVC membranes and old Acrylic coatings
  • Protection of Polyurethane Foam Insulation
  • Waterproofing and protection of Concrete constructions like Bridge-Decks, Tunnels, Stadium Stands, Car Parks, etc.

1,4 – 2,5 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 MARISEAL 250 is supplied in white and light grey. Other colors may be supplied on demand.


The MARISEAL 250 was tested by the German state testing institute for construction materials MPA-Braunschweig according the European Union Directive for liquid-applied roof waterproofing kits ETAG 005 and was found conforming.

The MARISEAL 250 was certified by the German state
Institute for construction techniques DIBt–Berlin with the European Technical Approval (ETA) and with the CE-mark and certification according to the EOTA (European Organization of Technical Approval).

The MARISEAL 250 was also tested and approved by various laboratories in different countries around the world.

European Technical Approval: ETA05/0197 DIBt
Levels of use categories according to ETAG005,
for liquid-applied Polyurethane waterproofing kits: Working life: W2 10 Years Climate Zone: M and S All

Imposed loads: P1 to P3 High Roof slopes: S1 to S4 30 Lowest surface temperature: TL3 -30C Highest surface temperature: TH4 +90C Reaction to fire: Class E EU Norm Resistance to wind loads ≥ 50 kPa EU Norm

Technical Data

PROPERTY RESULTS TEST METHOD Elongation at Break > 800 % ASTMD 412 / DIN 52455 Tensile Strength > 4 N/ mm 2 ASTMD 412 / DIN 52455

Water Vapor Permeability > 25 gr/m2/day ISO 9932:91 Resistance to mechanical damage by static impression High Resistance (class:P3) EOTA TR-007 Resistance to mechanical damage by dynamic impression High Resistance (class:P3) EOTA TR-006 Resistance to Water Pressure No Leak (1m water column, 24h) DIN EN 1928 Adhesion to concrete >2,0 N/mm 2(concrete surface failure) ASTMD 903 Crack Bridging Capability up to 2 mm crack EOTA TR-008 Hardness (Shore A Scale) 65 ASTMD 2240 (15”) Resistance to Root Penetration Resistant UNE 53420 Solar Reflectance (SR) 0.87 ASTME903-96 Solar Emittance (ε) 0.89 ASTME 408-71 Thermal Resistance (80C for 100 days) Passed – No significant changes EOTA TR-011 UV accelerated ageing, in the presence of moisture Passed – No significant changes EOTA TR-010 Resistance after water aging Passed EOTA TR-012 Hydrolysis (5% KOH, 7days cycle) No significant elastomeric change Inhouse Lab Construction Material Fire class Β2 DIN 4102-1 Resistance to Flying Sparks and Radiating Heat Passed DIN 4102-7 Service Temperature -30C to +90C Inhouse Lab Shock Temperature (20min) 200C Inhouse Lab Rain Stability Time 4 hours Conditions: 20C, 50% RH Light Pedestrian Traffic Time 12 hours Conditions: 20C, 50% RH Final Curing time 7 days Conditions: 20C, 50% RH Chemical Properties Good resistance against acidic and alkali solutions (5%), detergents, seawater and oils.


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 themembrane. Maximum moisture content should not exceed 5%. 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. WARNING: Do not wash

<strongRepair 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 and hairline cracks, of dust, residue or other contamination. Prime locally with the MARISEAL710Primer and allow 2-3 hours to dry. Fill all prepared cracks with MARIFLEX PU 30 sealant. Then apply a layer of MARISEAL250, 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 MARISEAL 250, until it is fully covered. Allow 12 hours to cure.
  • Clean concrete expansion joints and control joints of dust, residue or other contamination. Widen and deepen joints (cut open)if necessary. The prepared movement joint should have a depth of 10-15 mm. The width: depth ratio of the movement joint should be at a rate of approx. 2:1.
    Apply some MARIFLEX PU 30 Joint-Sealant on the bottom of the joint only. Then with a brush, apply a stripe layer of MARISEAL 250, 200mm wide centered over and inside the joint. Place the MARISEAL Fabric over the wet coating and with a suitable tool, press it deep inside the joint, until it is soaked and the joint is fully covered from the inside. Then fully saturate the fabric with enough MARISEAL250. Then place a polyethylene cord of the correct dimensions inside the joint and press it deep inside onto the saturated fabric. Fill the remaining free space of the joint with MARIFLEX PU 30 sealant. Do not cover. Allow12-18 hours to cure.


Prime absorbent surfaces like concrete, cement screed or wood with MARISEAL 710 or with MARISEAL AQUAPRIMER. Prime surfaces like bitumen-, asphaltfelts with MARISEAL 730 or with MARISEAL AQUA PRIMER. Prime non-absorbent surfaces like metal, ceramic tiles and old coatings with MARISEAL AQUA PRIMER. Allow the primer to cure according its technical instruction.

Application (cont.)

Waterproofing membrane

Stir well before using. Poor the MARISEAL 250 onto the 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 12-18 hours (not later than 48 hours) apply another layer of the MARISEAL 250.
For demanding applications, apply a third layer of the MARISEAL 250.

Reinforce always with the MARISEAL Fabric at problem areas, like wall-floor connections, 90 angles, chimneys, pipes, waterspouts (siphon), etc. In order to do that, apply on the still wet MARISEAL 250 a correct cut piece of MARISEAL Fabric, press it to soak, and saturate again with enough MARISEAL 250. For detailed application instructions with the MARISEALFabric, contact our R+D department.

RECOMMENDATION: We recommend reinforcement of the entire surface, with the MARISEAL Fabric. Use 5-10cm stripe overlapping.
ATTENTION: Do not apply the MARISEAL 250 over 0.6 mm thickness (dry film) per layer. For best results, the temperature during application and cure should be between 5C and 35C. Low temperatures retard cure while high temperature speed up curing. High humidity may affect the final finish.


If a color stable and chalking-free surface is desired, apply one or two layers of the MARISEAL 400 Top-Coat over the MARISEAL250. The application of the MARISEAL 400 Top-Coat, is especially required, if a dark final color, is desired. (e.g. red, grey, green) If a heavy duty, abrasion resistant surface is desired (e.g. Public Pedestrian Deck, Car Parking, etc), apply two layers of the MARISEAL 420 Top-Coat.
For the several Top-Coats application procedures, please consult their technical instructions or contact our R+D Department.

WARNING: The MARISEAL system 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.


MARISEAL250 is supplied in 25 kg, 15 kg, 6 kg, 1kg metal pails and 250 kg Barrels. Pails should be stored in dry and cool rooms for up to 9 months. Protect the material against moisture and direct sunlight. Storage temperature: 5-30C. Products should remain in their original, unopened containers, bearing the manufacturers name, product designation, batch number and application precaution labels.

Safety Measures

MARISEAL250 contains isocyanates. See information supplied by the manufacturer. Please study the Safety Datasheet. PROFESSIONAL USE ONLY

Mariseal 250



Mariseal 250 is a liquid-applied, solvent-based, one component, highly permanent elastic, cold-applied and cold-curing polyurethane membrane used for long-lasting waterproofing.

20L – 31cm x 31cm x 36cm

1.5-2.5kg per sq m applied in two or three layers

No of Coats:
2 coat application

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