MARISEAL® 275

Careful surface preparation is essential for optimum finish and durability.

• All surfaces must be structurally sound, dry, free of any laitance or loosely held particles that will affect the adhesion of the waterproofing membrane.
• New concrete surfaces must be min 28 days old with strength of 20 MPa, pull off strength > 1.5 MPa when tested as per ASTM D903 and moisture less than 5%.
• All old, loose coating, foreign materials, dust must be removed by mechanical grinding machine. All dust from grinding must be thoroughly removed.
• Any loose or hollow surface found must be broken up and must be repaired with polymer modified mortar.
• Any high spots of iron rebars must be carefully grinded to a smooth uniform surface.

• Carefully inspect the old bituminous surface for any air pockets or any loosely held surface. All loosely held surface must be removed mechanically.
• Any water contained in the pockets must be removed and surface must be allowed to dry naturally.

• Surfaces must be dry, clean and free from contaminants.
• Using mechanical grinder, ensure removal of dirt, dust, oil and all other contaminants that could interfere with adhesion of primer.
• Coat the treated surface immediately with epoxy primer.

• Careful sealing of cracks and joints before application is extremely important for long lasting waterproofing.
• Small cracks should be open out with mechanical tool, cleaned with vacuum cleaner, primed with epoxy primer weberprim Epox 501 and filled with epoxy mortar.
• After 3 hours, apply a coat of Mariseal® 275, 250 mm wide centered over the treated crack and while wet, cover with Mariseal® Fabric 65 200 mm wide. Press it firmly to soak. Saturate the Mariseal® Fabric 65 with ample quantity of Mariseal® 275, until it is fully covered. Allow it to dry for 12 hours to cure completely.

• Apply a coat of weberprim Epox 501, as primer for good and long-lasting adhesion.
• Mix the two components in designated ratio and apply same with a roller.
• Dry patches may be observed on concrete if surface is porous. In such a case, application of additional coat of weberprim Epox 501 is recommended.
• Wait 4-5 hours for the primer to surface dry before application of subsequent coat.

Product preparation

• After opening the bucket, mix the material with a mechanical stirrer until a homogeneous mixture is formed.
• Ensure to scrap the sides and bottom of the container with the stirrer.
• Do not add any solvent or any foreign material under any circumstances.

Application

• Pour Mariseal® 275 onto primed surface and spread it uniformly with onto the surface with brush or roller.
• For detail areas like floor wall joints, 90° Angles, pipes, waterspouts, etc reinforcement with Mariseal® fabric is recommended.
• In order to do that, apply a correct piece of Mariseal® Fabric while the coat of Mariseal® 275 is still wet, press it to soak and saturate the applied fabric with another coat of Mariseal® 275.
• After 12 -26 hours apply another coat of Mariseal® 275.
• For demanding applications, applications of additional coat of Mariseal® 275 may be recommended.

• If Mariseal® 275 is to be covered with tiles, broadcast silica sand of size 0.4 mm – 0.8 mm evenly on surface while the final coat is wet. The textured surface will give proper anchoring for fixing tiles with suitable tile adhesive.
• If Mariseal® 275 is to be covered with sloping screed, place a 160 GSM geotextile fabric as a separation layer over cured membrane. Place M-20 grade concrete with slope of 1:100 with proper slope towards the drain outlets.