A fiber-reinforced smoothing and filling plaster with good filling properties for wall surfaces in dry and wet areas. Layer thickness in holes 5–40 mm, in over plastering 5–20 mm. Suitable also for outdoor use, when coated. Cementitious.

Special features

  •  fibre-reinforced, multi-purpose
  •  over levellings, fillings
  •  coverage 1.6 kg/m²/mm
  • coatable: 1-3 d
  • interior areas; suitable also for exterior areas when coated





Kiilto OT is a wall plaster for smoothing rock material wall surfaces. The finished surface can be painted or tiled. If a smoother surface is needed, for example under waterproofing membrane, the surface can be over plastered with Kiilto’s finer wall plasters for wet areas, or by floating with a steel trowel.

Package Size EAN Code
20 kg 6411513720202
Bond strength

> 0,5 MPa (EN 998-1)



Compression strength

class CSIV (EN 998-1)


1 mm layer/m² solid matter weights approx. 1.6 kg

Curing rate

approx. 1-3 d (+18 °C) (depending on layer thickness and prevailing conditions)

Layer thickness

5–40 mm, in over plastering 5–20 mm

Max. grain size

3 mm

Mixing ratio

4.8-5.2 l water / 20 kg bag

Package sizes

20 kg bag


In an unopened package max. 1 year in dry conditions.

Substrate humidity

concrete < 90 % RH


Polymer-cement-sand -based powder

Working conditions

recommendation: +18–20 °C, lowest operating temperature +5 °C

Working time

2–3 hours (+18 °C)

Instructions for use

The surfaces to be plastered must be sufficiently solid, clean and free from dust. Dry surfaces must be lightly moistened prior to plastering. A new coat should not be applied until the previous one is dry. If needed, the surface should be carefully sanded and cleaned before applying a new plaster coat.

Strew Kiilto OT powder slowly in cool (+18–20 °C), clean water constantly stirring until a smooth, even mass is formed. Let the mix mature for approx. 10–15 min and then remix once again. Apply the plaster manually by using a steel trowel.

Additional information

The information given in this product data sheet is based on our tests and our practical knowledge. The technical data is defined in standard conditions. Variations in local working conditions and methods will affect the product performance and result. We guarantee the high quality of our products according to our Quality Management System. No liability can be accepted from incorrect use of the product or prevailing conditions, over which we have no control. Thus, we cannot be held responsible for the final result. The correct use of the product presupposes that the user has made him/herself aware of the contents of the working instructions and procedure guide, if provided.

Environment and safety

Avoid unnecessary skin contact and exposure with the fresh product, use safety gloves. Refer to material safety data sheet. For information on product and package disposal, visit www.kiilto.com.