Sikalastic®-590

Polyurethane modified acrylic dispersion

12 months from date of production if stored properly in original, unopened and undamaged sealed packaging.

The product must be stored properly in dry conditions at temperatures between +5 °C and +30 °C.

*) areas with high movement, irregular substrate or to bridge small cracks, joints and seams on the substrate.
**) consumption figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level and wastage etc.

+15 °C min / +35 °C max

80 % r.h. max

Beware of condensation, Surface temperature during application must be at least 3 °C above dew point.

+15 °C min / +35 °C max

< 6 % moisture content.
No rising moisture according to ASTM (Polyethilene-sheet)
No water / moisture / condensation on the substrate.

Before applying Sikalastic®-590 on Sikalastic®-590 diluted with 10 % water as primer, allow primer to dry:

Before applying Sikalastic®-590 on Sikalastic®-590 (without reinforced), allow 1st coat to dry:

Before applying Sikalastic®-590 on Sikalastic®-590 (reinforced with Sika Reemat Premium), allow material to dry:

*Note 1 : After thorough cleaning Sikalastic®-590 can be overcoated with Sikalastic®-590 at any time

Note : Times are approximate and will be effected by changing ambient conditions particulary temperature and relative humidity. Low temperature and high relative humidity retard curing, while high temperature and low relative air humidity accelerate curing progression.

Cementitious Substrate:

• New concrete should be cured for at least 28 days and should have a Pull off strength ≥ 1.5 N/mm2.
• Cementitious or mineral based substrates must be prepared mechanically using abrasive blast cleaning or scarifying equipment to remove cement laitance and to achieve an open textured surface.
• Loose friable material and weak concrete must be completely removed and surface defects such as blowholes and voids must be fully exposed.
• Repairs to the substrate, filling of joints, blowholes/voids and surface levelling must be carried out using appropriate products from the Sikafloor®, SikaDur® and SikaGard® range of materials.
• High spots must be removed by e.g. grinding.
• Outgassing is a naturally occurring phenomenon of concrete that can produce pinholes in subsequently applied coatings. The concrete must be carefully assessed for moisture content, air entrapment, and surface finish prior to any coating work. Installing the membrane either when the concrete temperature is falling or stable can reduce outgassing. It is generally beneficial, therefore, to apply the embedment coat in the late afternoon or evening.
• Prime the substrate and always use a reinforced system.

Bituminous Felt:

Ensure that bituminous felt is firmly adhered or mechanically fixed to the substrate. Bituminous felt should not contain any badly degraded areas. Prime and always use a totally reinforced system.

Bituminous Coatings:

Bituminous coatings should not have sticky or mobile surfaces, volatile mastic coatings, or old coal tar coatings. Prime and always use a totally reinforced system.
 

Metals:

Metals should be in sound condition. Abrade the exposed surfaces to reveal bright metal. Use locally reinforcement over joints and fixings.
 

For the other substrates: please contact to Sika Technical Department.

Prior to application, stir Sikalastic®-590 thoroughly for 1 minute in order to achieve a homogeneous mixture. Over mixing must be avoided to minimise air entrainment.

Prior to application of Sikalastic®-590, the priming coat must be applied and it must have cured tack-free. The primer coat is Sikalastic®-590 at consumption of ~0.3 kg/m² (diluted with 10 % water pbw).

Damageable areas (door frame) have to be protected with an adhesive tape.

Detailing
Always begin the installation with the details prior to the installation of the horizontal areas. Follow same process as reinforced system.

Coating System
Apply the first layer of Sikalastic®-590 maintaining a wet edge to ensure a seamless membrane. Once the first layer has cured enough (refer to the overcoating time window) apply the second layer of Sikalastic®-590.

Reinforced System
Apply the first layer of Sikalastic®-590 maintaining a wet edge to ensure a seamless membrane. Roll-in the reinforcement Sika® Reemat Premium and overlap by minimum 5 cm. The roller may require only a little bit of extra material to keep wetted but no further significant material is added at this stage. Once the first layer has cured enough (refer to the overcoating time window) apply the second layer of Sikalastic®-590.

TOOLS
 

Drill and paddle:
Sikalastic®-590 should be mixed for one minute using a drill and paddle.

Solvent resistant short-piled lamb skin roller:
Used in the application of Sikalastic®-590 to ensure a consistent thickness of the seamless SikaRoof systems.

Thick hair brush:
For application of Sikalastic®-590 to all details and penetrations.

Jet washer:
If dust, vegetation, moss / algae or other contaminants are present on the existing roof, a power washer is required to clean the substrate prior to the application of SikaRoof Systems. Existing chippings should be removed by hand or scabbling prior to power washing.

Airless spray equipment:
Used only for the roof coating systems. Two spray applied layers is the minimum requirement. The pump should have the following parameter:
-min. pressure : 220 bar
-min. output : 5.1 l/min
-min. Ø nozzle : 0.83 mm (0.033 inch)
For example : Wagner Heavycoat HC 940 E SSP Spray pack

Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.