Kiilto Pro J
Jointing plaster

A ready-mixed plaster for fixing and smoothing reinforcing tapes and edge profiles to gypsum plasterboards in dry interior walls and ceilings. Tape can be fixed by hand or machine.

Special features

  • Light colour, good filling capacity
  • Suitable also for finishing the substrate prior to wallpapering or painting
  • Filling capaxity max. 2 mm
  • Coverage 1 l/m²/mm
  • Drying time approx. 1-2 h/mm




Kiilto J is a water-soluble ready-mixed joint plaster for fixing reinforcing tapes to gypsum board plates and levelling interior walls and ceilings in dry areas. Suitable also for finishing the substrate prior to wallpapering or painting. The finished surface can be levelled, painted or furnished with wallpaper. We recommend painting the surface before wallpapering to aid future removal. Complies with the requirements of EN 13963:2005 and EN 15824:2009 standards.

Package Size EAN Code
3 l 6411512155036
10 l 6411512155104
Bond strength

> 0,3 MPa (EN 15824)

Classifications and certificates

stress grading RL01...RL04 of paintable surfaces (The RYL Code of building practice 2012)


Light grey

Curing rate

Approx. 1-2 h/mm (+18 °C) (depending on prevailing conditions)

Density/specific weight

approx. 1.6 kg/l

Flexural strength

> 320 N (EN13963)

Layer thickness

2 mm

Max. grain size

< 0,1 mm

Package sizes

3 l, 10 l plastic containers


In unopened containers, above +1 °C, for 1 year.


Polymer-limestone-based plaster

Working conditions

normal room conditions, lowest operating temperature +10 °C

Instructions for use

The surfaces to be plastered must be clean, dry and free from dust. 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.

Kiilto J is a ready-mixed plaster. After long storing, stir before use. The product can be diluted with water, if needed. Fixing of reinforcing tapes: Apply the plaster in joint and press the tape firm in plaster with a narrow steel trowel. After that smooth the joint by applying plaster over the reinforcing tape using a broad steel trowel. After drying the surface can be sanded, if necessary. If the board edges are not thinned, smooth the plaster widely enough outside the joint to have a smooth finish. In this case also the edges of the gypsum board are tapered.

Reinforcing tape can also be fixed to gypsum board with a special plaster machine. The product can be diluted with a small amount of water, if needed. Check also the gypsum board manufacturer's instructions.

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. The result is also strongly affected by working methods. 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. To use the product properly, please read the product brochure, work instructions and the safety data sheet available at

Environment and safety

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

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