Kiilto OT Light
Lightweight plastering mortar for walls

A lightweight smoothing plaster with good filling properties for walls in wet and dry areas. Sprayable. Very low drying shrinkage. When coated suitable also for exterior use. Partial plastering 5-50 mm, over plastering 5-30 mm. Cementitious.

Special features

  •  light to apply, very low drying shrinkage 
  •  over levellings, fillings
  •  coverage 1.3 kg/m²/mm
  • coatable:1-3 d
  • interior areas; suitable also for exterior areas when coated





Kiilto OT Light is a lightweight plastering mortar for 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 SK Märkätilatasoite, wall plaster for wet areas, or by floating with a steel trowel.

Package Size EAN Code
20 kg 6411513952207


Compression strength

CSIII (EN 998-1)


1 mm layer/m² solid matter weights approx. 1.3 kg

Curing rate

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

Layer thickness

partial levelling 5-50 mm, over plastering 5-30 mm

Max. grain size

2 mm

Mixing ratio

4.2-5.0 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

Working conditions

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

Working time

approx. 2 hours (+18 °C)

Instructions for use

The surfaces to be plastered must be sufficiently solid, clean and free from dust. Indoors, dry porous surfaces should be wetted with water before plastering or treated with a mixture (1:4) of water and Kiilto Pro Start Primer or Kiilto PrimerOne. 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 Light 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 by spraying and smoothen with a steel trowel. Can be applied with most common spraying guns for plasters, provided that the nozzle is big enough.

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

M1 emission classification for building material
CE marking
Key Flag
The Nordic Swan Ecolabel