Sikalastic® U-Primer

Solvent-based polyurethane

9 months from date of production

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +30 °C. Always refer to packaging.

~1,01 kg/l

+10 °C min. / +40 °C max.

85 % max.

Beware of condensation.

The substrate and uncured applied material must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the floor finish.

+10 °C min. / +60 °C max.

≤ 4 % parts by weight

Test method: Sika®-Tramex meter, CM-measurement or Oven-dry-method. No rising moisture according to ASTM (Polyethylene-sheet).

Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
* After 24 hours the surface must be re-primed prior to the application of Sikalastic® U-Primer.

~0.2 kg/m² per coat

This figure is theoretical and does not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc.

The supporting structure must be of sufficient structural strength to apply all new and existing layers of the roof build-up. Complete roof system must be designed and secured against wind uplift loadings.

The substrate must be uniform, firm, smooth and free of any sharp protrusion or burrs, clean, dry, free of grease, bitumen, oil, dust and loosely adhering particles.

Cementitious substrates must be prepared mechanically using suitable abrasive blast cleaning or planing / scarifying equipment to remove cement laitance and achieve an open textured gripping surface profile suitable for the product system thickness.

High spots can be removed by grinding.

Weak cementitious substrates must be removed and surface defects such as blow holes and voids must be fully exposed.

Repairs to the substrate, filling of cracks, blowholes/voids and surface levelling must be carried out using appropriate products from the Sikafloor®, Sikadur® and Sikagard® range of materials. Products must be cured before applying Sikalastic® U-Primer.

All dust, loose and friable material must be completely removed from all surfaces before application of the product and associated system products, preferably by vacuum extraction equipment.

Apply Sikalastic® U-Primer onto the prepared substrate by brush or roller. Ensure a continuous, pore free coat covers the substrate. If necessary, apply two coats.

Confirm waiting /overcoating time has been achieved before applying subsequent coats or products.

Seal container immediately after use.

Clean all tools and application equipment with Thinner C immediately after use. Hardened material can only be removed mechanically.