Product Data Sheet
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Sikalastic® U-Coating

Polyurethane fast drying topcoat for roof waterproofing

Sikalastic® U-Coating is a 2-part, polyurethane, fast drying top coat for roof waterproofing. Part of the SikaRoof® MTC-05/-08/-10 UV AP System and can be used to overcoat different 1- or 2-part aromatic polyurethane base coats.                                 

  • Good workability and recoating properties
  • Cures at low temperatures (-5 °C)
  • Cold applied - requires no heat or flame
  • Easily recoated - no removal required
  • Seamless coating
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Product Data Sheet
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Usage

  • On fully exposed new construction or refurbished flat roofs
  • Top coat over aromatic polyurethane base coats
  • Top coat of Sikalastic® roof waterproofing or coating systems
 

Advantages

  • Good workability and recoating properties
  • Cures at low temperatures (-5 °C)
  • Cold applied - requires no heat or flame
  • Easily recoated - no removal required
  • Seamless coating

Packaging

Part A

13.3 kg

Part B

2.7 kg

Colour

Appearance

Gloss

Colour

Green, Grey

Other colours on request.

Applied colours selected from colour charts will be approximate.

For colour matching: Apply colour sample and confirm selected colour under real lighting conditions.

When product is exposed to direct sunlight, there may be some discolouration and colour variation, this has no influence on the function and performance of the coating.

Product Details

Product Information

Composition

Aliphatic polyurethane

Shelf Life

12 months from date of production

Storage Conditions

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +25 °C. Always refer to packaging.

Density

~1.2 g/cm³

Solid content by volume

Approx. 48 %

Application

Application Information

Mixing Ratio

Part A : Part B = 10 : 2 (by weight) 

Product Temperature

10 °C min.

Ambient Air Temperature

-5 °C min. / +40 °C max.

Relative Air Humidity

85 % max.

Dew Point

Beware of condensation.
The substrate and uncured applied floor material must be at least +3 °C above dew point.

Substrate Moisture Content

≤ 4 % parts by weight

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

No water / moisture / condensation on the substrate.

Pot Life

Temperature

Time

+10 °C

~7 hours

+20 °C

~5 hours

+30 °C~3 hours
+40 °C~2 hours
Application steps

EQUIPMENT

Select the most appropriate equipment required for the project:

Mixing

  • Electric single paddle mixer (300–400 rpm)

Application

  • Brush or solvent resistant rollers
  • Air spray with machines: nozzle orifice of 1.0–1.5 mm, nozzle pressure 0.3–0.4 MPa
  • Airless spray with machines: nozzle orifice of 0.44–0.49 mm, nozzle pressure 20 MPa

SUBSTRATE PREPARATION

If the overcoating time of the existing base coat has been exceeded, the surface may be roughened using light abrasive manual tools or mechanical equipment.

All contamination such as dust, loose and friable material that could affect final finish or reduce adhesion, must be completely removed from all surfaces before application of the product, preferably by vacuum extraction equipment.

MIXING

Prior to mixing all parts, mix separately Part A (resin) using an electric paddle mixer or other suitable equipment. Mix liquid and all the coloured pigment until a uniform colour / mix has been achieved. Add Part B (hardener) to Part A and mix Part A + B continuously for 3.0 minutes until a uniformly coloured mix has been achieved. Mix full units only. Mixing time for A+B = ~3.0 minutes.

APPLICATION

Apply mixed product in 1 coat by roller, brush or spray equipment to achieve a consistent thickness and required surface finish.

CLEANING OF TOOLS

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

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