WK

The surface must be properly prepared before applying NEXLER WK. The substrate intended for product application should be continuous, bonded, seasoned and load-bearing. If the substrate is contaminated with petroleum-based agents, these must be removed effectively. The substrates should be cleaned mechanically, dust, tarnish, any loose layers, sharp protruding edges and impurities that worsen adhesion should be removed. If there are cavities in the substrate (honeycombing, gravel pockets and other unevenness), it should be repaired, filled and levelled. Partitions made of small-size elements must have an even face and full joints. The substrate on which the product will be used must be continuous. If this condition is not met, 
a levelling plaster should be made. NEXLER WK can be used on a dry or slightly damp substrate. A damp substrate prolongs the setting time. 
Prime the prepared substrate with a NEXLER BITFLEX Primer solution. Do not allow dirt on the priming layer.
NEXLER WK can be applied over existing coatings of dispersion bitumen compounds following prior preparation and priming.  
Clean steel surfaces of rust and flaking paint coats, then degrease. 
Edges and corners: The exterior right angles should be chamfered (bevelled), while the interior angles should be properly rounded by making facets. On mineral substrates, a facet can be made of mineral mortar e.g. NEXLER RENOBUD R 103 (radius 4 - 5 cm) or PMBC (KMB) compound e.g. BITFLEX 1KP (radius 2 cm). On bituminous substrates make a facet of PMBC (KMB) compound. A cat's tongue trowel is best suited for creating facets.

Check the production date on the packaging before use. The product should not be incorporated beyond its shelf life. The product should not be objectionable (e.g. lumps, fibres, discolouration) after opening. After mixing, the compound should be homogeneous and free of lumps and clumps resulting from under-mixing. Do not use a product that bears signs of frostbite. The correct consistency of the product is not dry or rubbery. When properly mixed, the product forms a homogeneous coating when spread over the surface with a tool.

NEXLER WK is a ready-to-use product. Before use, the product should be mixed until a homogeneous mass is obtained. Repeat mixing from time to time during application.

Thickness of a layer should be checked by material consumption control on a dedicated surface. In addition, it is recommended to measure the thickness of the freshly applied sealing layer with special inspection plates, the measurement point should be filled with putty immediately. 
After it has dried, a properly made coating should be a uniform, clean coating, without peeling and other defects. The coating should adhere closely to the primed substrate. 
When bonding the boards, the quantity, size and thickness of the applied strips or spots should be controlled.

Damp-proofing of underground parts of structures: NEXLER WK is recommended to be applied on a primed substrate. The next layer can be applied after the previous one has fully dried. The total thickness of a dry layer should be at least 1 mm. Apply material by hand, using a paint brush or a roofing brush. 
The freshly applied coating must be protected from strong sunlight (e.g. by shading), flooding, rain and negative temperatures. The time for the waterproofing to cure completely, allowing the excavation to be backfilled, is 3 to 7 days. After curing, the waterproof coating should be protected against mechanical damage associated with backfilling the excavation.

Bonding of thermal insulation boards to foundation walls: Apply thermal insulation boards after the waterproofing layer has fully set (dried). Hydrophobized insulation boards should be sanded before bonding. Apply NEXLER WK compound in spots on thermal insulation boards (8 - 10 palm-sized spots per a 0.5 m² board), then wait approx. 20 minutes before bonding the board. After the wait, the boards should be applied and firmly pressed against the even substrate. Start the bonding from the bottom of the excavation. Thermal insulation boards are recommended to be supported on the footing offset and, if this is not possible, to be supported  during bonding. Backfilling the excavation can be done after 3 - 7 days, after full bonding properties of the compound are obtained.

Bonding of insulation and thermal insulation materials to sheet metal, concrete, bituminous felt substrates: Apply NEXLER WK compound in spots to polystyrene boards or mineral wool (6 - 8 palm-sized spots per a 0.5 m² board). Then wait approx. 20 mins before bonding the board. After waiting, press the boards firmly and precisely onto the substrate.

Bonding the underlayer bituminous felt to the thermal insulation board: Apply NEXLER WK compound using 8 cm wide strips in an amount of 4 to 6 per 1 m of board width, or approximately 2 mm thick spots (6 - 8 spots per a 0.5 m² board). Wait approx. 15 - 20 minutes (depending on the weather conditions) and press down the board firmly. 
It is not permissible to apply bituminous felt “from a roll”. The sheets of underlayer bituminous felt are glued together with overlaps. Cut sheets 10 cm larger than the size of the thermal insulation board. Weld the top layer bituminous felt to the underlayer bituminous felt no sooner than two days later.

Before use, please read the application details in the product's Technical Data Sheet.