Helios > Decorative paints > Wood

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Wood coatings BORI

Wood behaves as a living organism – also after the applied value is added to it. Different kinds of wood swell and shrink under the influence of moisture and differences in temperature to a different extent. Under the influence of UV light lignin in wood is destroyed, wood becomes greyish, rough and dry. It is attacked by insects and micro-organisms. Among those most dangerous in our region we must mention house fungus, brown putridity and blue mould. If wood is left unprotected, it ages fast and loses on quality and aesthetic value.

The choice of appropriate protective coating is therefore of prime importance. The wood in the open air in particular must be well protected with elastic coatings offering protection against weather and biological influences.

For the protection and decoration of wood we produce at Helios three basic types of coatings: stains or transparent paints BORI, top paints TESSAROL and lacquers IDEAL and TESSAROL.

What are BORI?

BORI are stain, transparent wood coatings, which form a transparent film on the surface.

BORI thin-layered stain with biocide and BORI impregnation:

  • protects wood against plant and/or animal microorganisms;
  • penetrates deep into wood.

BORI thin-layered stain:

  • paints wood decoratively and protects it against external influences;

  • transparent pigments emphasize wood natural appearance

  • it is used as the stain before painting with IDEAL parquet lacquer and TESSAROL lacquers.


  • forms a rich, silky gloss coating film;

  • contains waxes, which increase coating's water repulsion

  • contains UV filter, which protects wood against influences of sun;

  • protection film will not crack and not peel off;

  • provides wood's dimensional stability – under the influence of moisture wood will not shrink and not swell.

What does have influence on wood protection?

  • quality of stain, which we use;

  • correct choice of stain or stain system for method of use and exposure to aggressive environment;

  • stain colour shade; number of coats and quality of performance;

  • type and quality of wood, construction and its position;

  • regular maintenance.

Basic conditions:

  • for painting you choose a nice day without rain and fog, as high air humidity has bad influence on drying of paint;

  • do not paint objects in the morning, as there are dew rests on them, wait until they dry and warm up to environmental temperature.

Surface treatment:

  • prior to painting wood should be dry: humidity content in conifers should not exceed 15%, in foliage plants 12%;

  • remove grease and similar impurities with a suitable thinner;

  • old paint coats, which do not stick to surface should be removed completely mechanically with paint removers or heat;

  • old paint coat, which you only wish to refresh clean thoroughly and sand slightly.

Important instructions for work and selection of a suitable stain:

  • you choose the correct stain for product, which you wish to paint and for conditions, to which it is exposed by means of instructions, stated on our web site and on packaging;

  • prior to start of painting a coat, mix stain thoroughly;

  • make a test on a small part of old paint coat, so that a new stain will not dissolve or soften the old one;

  • due to high influence of type of wood to a final colour shade, we recommend to make a test on a smaller part of surface, which you want to protect and decorate;

  • clear stains let a lot of ultraviolet rays through, which destroy lignin in wood (wood becomes grey), therefore we do not recommend them as an independant coating for wood in the exterior.

  • BORI stains on basis of water binders (BORI impregnation, BORI stain UV PROTECTION):

- in the instructions for work (on packaging) temperature is stated, at which coating film is built (limit values are stated);
- use suitable tools for water-based paints
- paint should not freeze

  • apply stain in several thin layers in time intervals,stated in the instructions;

  • at painting of projecting roofs,claddings we recommend impregnation of wood from both sides, as herewith we achieve a better dimensional stability;

  • the most suitable way for painting is if the objects to be painted are in the horizontal position;

  • start to paint fixed objects from back- to forwards and from down upwards

  • at the painting of larger surfaces you have to paint the complete surface at once – do not interrupt work;

  • number of coats of a stain coating has influence on the colour shade – each additional coat darkens the colour shade;

  • at the renovation of old stain coatings you should choose a lighter colour shade from the originally used or you mix the original colour shade with a clear one in the suitable quality;

  • possible spots, which occur at painting you may remove fresh with NITRO or TESSAROL thinner;

  • wash used tools immediately after use (with thinner or water).


  Reasons for defects
Bad stain adhesion   Badly cleaned surface, presence of grease.
Rough surface   Let out of wood sanding or first stain coat.
Soft and not resistant top coat   Too quick application of individual coats.
Stain will not dry   Not rinsed chemical paint removers, too high humidity and too low temperature.
Stain cracks, hairy cracks and wrinkles   Stain application in one thick coat.
Peel off   Not removed old stain, which peled off, badly cleaned surface.
Quick »grey« appearance of wood, which is exposed to weather influences   Protection with clear stains, which contain no UV filtre.
Unsuitable colour shade   Prior to use unmixed or badly mixed stain.
Darker colour shade at renovation   Use of the original colour shade.
Appearance of clods on the stain surface   Not cleaned tools, badly cleaned surface, mixing of solvent-based and acrylic stains.
Spotty surface   Uneven stain coat application.
Bubbles on the surface   Use of wrong or not sufficiently clean tools.

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