The base must be undamaged, clean, rough and damp enough to be darker in colour. There must be no cement paste on the surface. Begin wetting the base on the previous day. The required amount of wetting depends on the weather conditions and, for instance, the strength of the base. You must always ensure that there is no standing water on the base when starting rendering. If necessary, use Fescon Adhesive Plaster.
Total water requirement is around 2.5 l/25 kg of dry product. Add the dry material to the water and mix with a power mixer for around one to two minutes allow to stand for five minutes and mix again for a short while. Find the final consistency at this stage by adding water when necessary. However, keep the total amount of water at around 10% of the dry product. The finished plaster remains workable for around one hour.
Adhesion to the base concrete is ensured through careful compacting and, if necessary, by applying a separate adhesion layer on the base with a brush. Do not allow the adhesion layer to dry before spreading the plaster. If necessary, use Fescon Adhesive Plaster. The thickness of a casting layer spread at one time is around 10 to 50 mm. When doing thicker casts, leave the lower layer rough so that adhesion between casting layers is as good as possible. The lowest working temperature is +5°C. The mass and base must always be at a temperature of at least +5°C.
The aftercare must be begun immediately after the plaster has been spread and must continue for at least seven days. We recommend using plastic covering / curing compound and a hood. The aftercare is stopped in stages. When doing extensive surface casting, you must pay special attention on not only aftercare but also the preparation of the base and the casting work itself to avoid cracks.
Storage and handling of waste
See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank