Mariseal 250 FLASH

Consumption
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.

Application

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 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 surface with water!

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® 710
• Primer and allow 2-3 hours to dry. Fill all prepared cracks with MARIFLEX® PU 30 sealant. Then apply a layer of MARISEAL®
• 250 FLASH, 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 FLASH, 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.

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 FLASH, 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 FLASH. 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 12-18 hours to cure.

Priming

Prime absorbent surfaces like concrete, cement screed or wood with MARISEAL® 710 or with MARISEAL®    AQUA PRIMER. 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 FLASH 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 FLASH.

For demanding applications, apply a third layer of the MARISEAL®250 FLASH.

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

ATTENTION: Do not apply the MARISEAL® 250 FLASH over 0.6 mm thickness (dry film) per layer. For best results, the temperature

Low temperatures retard cure while high temperature speed up curing. High humidity may affect the final finish.

Finishing

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 FLASH. 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.