Application of reactive resin products

Epoxy and polyurethane resins are supplied in two matched components and are brought to reaction by intensive mixing. Resin base and hardener react chemically by cross-linking to form mechanically and chemically highly resistant end products. These so-called liquid resins are used as primers, levelling coatings or screed binders. The mixing and processing of these very high-quality products requires special care and expertise.

Simple & safe to the goal

  1. Safety first

    1. Reactive resins are usually subject to labelling and therefore make special demands on work safety. For the processing of epoxy resins, the national Employer's Liability Insurance Associations stipulate that protective goggles, long-sleeved clothing and special gloves must be worn, and that neither eating nor smoking should be allowed during processing.

  2. Proper storage

    Reactive resins should be stored in a temperature range of > +15 °C to +25 °C. Cold resin components behave like honey and can only be mixed with great difficulty or insufficiently. Inversely, if the components are stored in a very warm environment (inside a vehicle in the sun), an immediate reaction occurs during mixing. The processing time is thus extremely shortened.

  3. Required documents

    In addition to the technical data sheet, the EN safety data sheets are available for all Weber products. They can be downloaded from our website  Printed copies of these documents should be available on the construction site.

  4. Mixing

    1. Two-component reactive resins are supplied in 2 pre-mix twin packagings (component A = resin base and component B = hardener). The mixing ratio A : B is indicated in parts by weight on the label. Withdraw partial quantities only by exact weighing.

  5. 2. A ready-to-use material is obtained by intensive mechanical mixing of both components. In the case of coloured and filled (i.e blended with silica sand) reactive resins, the corresponding component (usually A-component) must be intensively stirred in advance.

  6. 3. When decanting the compound into an empty mixing vessel after mixing and when mixing again for one more minute, the mixing will be improved. When using partial quantities, the mixing ratio given on the container label must be observed. The product must be applied immediately after mixing.

  7. 4. Attention must be paid to the bottom and walls of the packaging during mixing. This will prevent any inaccurate dosage. After mixing, no colour difference should be visible in the mixture.

  8. 5. If fillers (silica sands) are added to the reaction resin, they must be brought to a temperature of at least +15 °C beforehand. Especially with premixed grading curves, whole bags should be used because of possible transport segregation.

  9. 6. The freshly mixed binder is added to the aggregates (fillers) with the running compulsory mixer until a lump-free consistency is obtained.

  10. Application

    1. Reactive resins generate heat during the curing process. This can cause the mixed material in the mixing vessel to heat up very quickly. Therefore, the reaction resin should be poured out quickly after mixing and spread (as coating) with the rake weber Großflächenrakel + triangular notched blade weber Zahnleiste or (as primer) with a rubber squeegee.

  11. 2.  Then the primer is smoothed down uniformly with a shorthair lambskin roller. Accumulations of material are to be avoided. The still fresh primer is evenly sprinkled with approx. 1.5 - 2.5 kg/m2 of oven-dried silica sand weber.floor 4936 (0.3 - 0.8 mm).

  12. 3. Levelling (self-spreading) coatings are applied with the rake weber Großflächenrakel + notched blade weber Zahnleiste no. 1 (notch 2.5 mm) in the intended layer thickness and de-aerated with a spike roller in crosswise motions for approx. 5 - 10 minutes. On inclined or vertical surfaces, the mixture can be adjusted to a non-sag consistency by adding the thixotropic agent weber.floor 4917 and applied with a trowel.

  13. 4. Anti-slip surfaces are obtained by scattering quartz sand onto the still fresh coating. Silica sand should be added until no more binder rises. As suitable sands use medium grain sizes (e.g 0.3 - 0.8 mm) and coarse ones (e.g 0.7 - 1.2 mm). Fine sands (e.g 0.1 - 0.3 mm) are not suitable because of the risk of clod formation.

  14. 5. As a rule, the excess quartz sand that is not firmly bonded is removed the next day. A light intermediate mechanical sanding removes grain peaks and gives a more even surface. The surface should then be well vacuumed.

  15. 6. For improving the cleaning operations, apply a sealer on top, for ex. the multi-use EP coating weber.floor 4740. For this purpose, the material (unfilled - without silica sand) is poured onto the floor, first spread with a rubber squeegee with a soft lip and afterwards a shorthair lambskin roller for providing a thin layer.

  16. Application on vertical surfaces

    1. When working on inclined or vertical surfaces, the otherwise reactive resin coatings with high flow can be adjusted to a trowel-grade consistency by adding the thixotropic agent weber.floor 4917. Depending on the desired consistency and application, mix the pre-said product at a rate of 2% and 8 % by weight into the already mixed binder.

  17. 2. The thixotropic adjusted material can now be applied in thin layers with a roller or in thick layers with a flat trowel. In case of multiple roller application, it is recommended to make the intermediate layers non-skid by scattering quartz sand (0.1 - 0.3 mm) so that the roller does not slip during application. This also increases the adhesion of the intermediate coat and ensures a uniform application thickness.

  18. 3. The transition from the horizontal to the vertical surface is formed by installing a triangular wedge or a bottle-form groove of epoxy resin mortar. The leg length should be 30 - 50 mm. The mixing ratio of the epoxy resin mortar is 1 : 7 parts by weight of the epoxy resin primer weber.floor 4710 or 4712 (EC 1 - very low emission) and the silica sand (max. grain size 1.2 mm) weber.floor 4932.

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