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Sikalastic® WP 668

(former MTile WP 668)

Waterproof, flexible protective coating for use under all tile and natural stone coverings in internal wet areas

Sikalastic® WP 668 is a single part acrylic resin based waterproofing, that provides a flexible protective coating, beneath ceramic tile and natural stone installations in wet areas.

  • Waterproof and protects moisture-sensitive substrates
  • Flexible, compensates tensions and minor deformations of the substrate, variations in temperature and vibrations
  • Crack-bridging, high security even with subsequent cracks in the substrate
  • Ready-to-use, easy to apply by roller, brush or trowel
  • Two-coloured, for easier visual control of the layer thickness
  • Resistant to lime water, ensures bonding between protective coating and mortar if the adhesive bed is constantly submerged in water
  • Waterborne, no harmful risk to the environment, can be used without any risk to health
 
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Usage

  • Liquid area waterproofing to be applied by roller, brush or trowel.
  • For indoor use.
  • For walls and floors.
  • For wet areas such as bathrooms, showers in residential buildings, hotels, old people's homes and hospitals
  • On moisture-sensitive, absorbent substrates, e.g. plasters, plaster slabs, gypsum fibre boards, plaster boards, wooden chipboards, anhydrite screeds in moist and wet areas subject to usual domestic use.
  • On absorbent mineral substrates, e.g. concrete, screed, render, aerated concrete, cementitious levelling compounds for walls and self levelling compounds such as SikaLevel® and SikaScreed®range.
 

Advantages

  • Waterproof and protects moisture-sensitive substrates
  • Flexible, compensates tensions and minor deformations of the substrate, variations in temperature and vibrations
  • Crack-bridging, high security even with subsequent cracks in the substrate
  • Ready-to-use, easy to apply by roller, brush or trowel
  • Two-coloured, for easier visual control of the layer thickness
  • Resistant to lime water, ensures bonding between protective coating and mortar if the adhesive bed is constantly submerged in water
  • Waterborne, no harmful risk to the environment, can be used without any risk to health
 

Packaging

25 kg plastic pail

Colour

Red and Grey

Product Details

Product Information

Composition

Solvent-free synthetic resin dispersion

Shelf life

6 months from date of production

Storage conditions

Store in undamaged, unopened, original sealed packaging in dry conditions at temperatures between +5°C and +35°C. Protect from direct sunlight, heat and moisture.

Density

~1.5 g/l (at 25°C)
Technical Information

Tensile adhesion strength

≥ 1.5 N/mm² (on concrete)

(ASTM D 4541)

Application

Application Information

Substrate temperature

+5°C min. / +40°C max.

Drying time

1st coat

1 - 2 h

2nd coat (ready for tiling)

1 - 2 h

At +23°C and 50% relative humidity. Higher temperatures reduce, lower temperatures increase the times given.
Consumption

Consumption

Minimum consumption at required dry layer thickness of 0.5 mm

~1.1 kg/m²

(~0.76 l/m²)

Note: Consumption depends on the substrate roughness and might increase. This figure is theoretical and does not include for any additional material required due to surface porosity, surface profile, variations in level and wastage etc..
Application steps

SUBSTRATE PREPARATION

  • The substrate must be sound, dry (cement screed 4%, anhydrite pourable screed 0.5%, measured with the CM meter), clean and free from oil, grease and other residues which should be removed by sand-blasting, brushing or shotblasting (Blastrac) if necessary.
  • The surface shall be smooth and must not have any honeycombs, gaping cracks or ridges.
  • Prime gypsum-based substrates and plaster boards beforehand with undiluted SikaCeram® P 302.
  • Absorbent mineral substrates should be primed with SikaCeram® P 302, diluted 1 : 1 with water. The primers must have cured prior to the application of Sikalastic® WP 668.
 

APPLICATION

  • Apply undiluted Sikalastic® WP 668 by roller (lambskin roller), brush (wall brush, float), or trowel to the substrate to cover the entire area.
  • A minimum of two coats are required.
  • Place SikaCeram® WP Tape over pipe culverts and floor drains, in corner joints and floor/wall junctions. Press SikaCeram® WP Tape into the first coat of Sikalastic® WP 668.
  • Any projecting edges of the fabric are covered by the second coat.
  • Any further coat is applied when the first coat is dry.
  • For easier control of coverage, it is recommended to apply the first coat with Sikalastic® WP 668 red and the following coat(s) with Sikalastic® WP 668 grey.
  • If the previous colour is visible, the thickness of the applied coat is too thin. This should be avoided.
  • When Sikalastic® WP 668 has cured, tiles can be laid with the suitable adhesive (min. C2 class) on vertical and horizontal areas.
  • Natural stone tiles should be laid with the relevant natural stone adhesive.
  • When applied on floating screeds, it is recommended to leave at least 10 mm in the floor/wall connection treated with SikaCeram® WP Tape, free from Sikalastic® WP 668.
  • If the surrounding area is sensitive to moisture, waterproofing should be applied also below and behind the shower base and bathtub.
  • Any penetration through the waterproofing system should be treated as per the best industry practice, using gaskets and tapes. If in doubt, contact Sika Technical Service Department for recommendation.

CLEANING OF EQUIPMENT

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

 

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