Sika Sikagard® 545 W Elastofill is a versatile product that can be used as a filler coat for small cracks and joints but has been primarily designed for use as an intermediate coat for crack bridging protective coating systems.
Sikagard®-545 W Elastofill is best used for creating a protective system and bridging cracks that have formed in concrete structures. This multi-purpose product works especially well outdoors on exposed concrete structures that have a high risk of cracking and works to prevent this from happening.
The surface must be dry, sound and free from loose and friable particles. Suitable preparation methods are steam cleaning, high pressure water jetting or blast cleaning. New concrete must be at least 28 days old. If required, a levelling cement based pore sealer (e.g. Sika® MonoTop®-723 N, Sikagard®-720 EpoCem® etc.) can be used – refer to the respective product data sheet. Allow a curing time of at least 4 days before coating (except when the EpoCem is used, then coating can be applied within 24 hours).
Exposed concrete with existing coating: Existing coatings must be tested to confirm their adhesion to the substrate and their suitability - adhesion test average > 0.8 N/mm2 with no single value below 0.5 N/mm2. – refer to the relevant Method Statement for more details on the data sheet.
For water based coating, use Sikagard-552 W Aquaprimer as primer. For solvent based coating, use Sikagard-551 S Elastic Primer as primer. In case of doubt, carry out adherence testing to determine which primer is most suitable – wait at least 2 weeks prior to conduct the adhesion test - an average value of 0.8 N/mm² is required with no single value below 0.5 N/mm².
Please note: The concrete surface must have a fine gripping texture. Very smooth surfaces may require two applications with Sikagard®-545 W Elastofill in order to close up all surface blowholes and pores etc.
Apply Sikagard®-551 S Elastic Primer or Sikagard®-552 W Aquaprimer evenly onto the substrate. On very dense substrates up to 10% Sika Thinner C may be added to Sikagard®-551 S Elastic Primer.
Intermediate coat: Sikagard®-545 W Elastofill shall be applied by brush or mechanical spray (screw type pump). Blowholes and pores etc. must be carefully filled, using sufficient material. Attention must be paid to endure a uniform application. If a decorative surface texture is to be preserved, application must be carried out
following the lines of the texture runs.
Texturing of the surface: First application as described above. For the second application, Sikagard®-545 W Elastofill shall be rolled on with shortpiled rollers with the addition of 2 to 3% water. This method gives an attractive finished texture.
Trowel applied re-profiling mortar: Add & mix with electric stirrer up to 20% by wt of 0.1 - 0.3mm kiln dried quartz sand to Sikagard 545 Elastofill to achieve the required consistancy and apply and smooth by trowel. Note mechanical properties will change when sand is added.
Top coat: Sikagard®-550 W Elastic shall be applied by brush, roller or airless spray.
Surface and Environment
Sikagard® 545 W Elastofill has been designed primarily for use outdoors and is highly suited for application to concrete structures that are liable to cracking. This product is environmentally friendly and is safe to use externally.
- Sikagard® crack bridging system complies with the requirements of EN 1504-2 as protective coating.
- Uses Sikagard® 545 W Elastofill is designed as a crack-bridging intermediate coat in combination with Sikagard® 550 W Elastic
- Available in 15 Litres