Mariseal 250 AQUA

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%. 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 and hairline cracks, of dust, residue or other contamination. Prime locally with the MARISEAL®
AQUA PRIMER and allow 2-3 hours to dry. Fill all prepared cracks with MARIFLEX® PU 30 sealant. Then apply a layer of
MARISEAL® 250 AQUA, 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 AQUA, until it is fully covered. Allow 18 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 AQUA, 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 MARISEAL® 250 AQUA. 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. Allow 18 hours to cure.

Priming
Prime highly absorbent and brittle surfaces like concrete, cement screed, mortar, plaster, wood and non-absorbent surfaces like metal and ceramic tiles with MARISEAL® AQUA PRIMER. Allow the primer to cure according its technical instruction. Waterproofing membrane Stir well before using. Poor the MARISEAL®250 AQUA onto the prepared and 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. Reinforce always with the MARISEAL®FABRIC at problem areas, like wall-floor connections, pipes, chimneys, waterspouts (siphon), lightdomes, etc. In order to do that, apply on the still wet MARISEAL® 250 AQUA a correct cut piece of MARISEAL® FABRIC, press it to soak, and saturate again with enough MARISEAL® 250 AQUA. For detailed application instructions with the MARISEAL® FABRIC, contact our R+D department. After 18-36 hours apply another layer of the MARISEAL®250 AQUA. For better waterproofing results apply a third layer of the MARISEAL® 250 AQUA.
ATTENTION: Do not apply the MARISEAL®250 AQUA over 0.5 mm thickness (dry film) per layer.
ATTENTION: Do not apply the MARISEAL 250 AQUA 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 (fog or dew conditions) retard cure and affect the curing times.

Finishing
If a color stable, chalking-free and heavy duty, more abrasion resistant surface is desired, apply one or two layers of the MARISEAL® 400 AQUA Top-Coat over the MARISEAL® 250 AQUA. The application of the MARISEAL®400 AQUA Top-Coat, is especially required, if a dark final color, is desired. (e.g. red, grey, green)