Various species of exotic wood are not suitable for applying water-soluble coatings, as these coatings give the wood a yellowish tint. What kinds of wood are we talking about?? The staining of the wood by water-soluble paints occurs with the following types of wood: aphromosis, hang on, Dark Read Meranti, Douglas fir, framire, Kambala, mahogany, non-white, marbau, I will come with that. Generally, this restriction applies to water-soluble opaque varnishes.

What tropical wood species contain substances that retard drying?
This is especially true of the wood of the following species: aphromosis, Afzelia, azobe i tek.

Various substances in contact with oak wood discolor its surface. What materials are we talking about??
As a result of a chemical reaction with tannic acid, contained in oak wood, staining of steel and other biocatalysts may occur.

Why you shouldn't apply dark coatings to resin-rich wood?
The resin softening point is approx. 333 K (60°C). Under the dark coating, the wood heats up to approx. 353 K (80°C). Therefore, with a dark coating, it is difficult to avoid resin leakage.

What is meant by "wood that keeps dimensions" and "wood that does not keep dimensions"?

The term "dimensionally stable timber" is understood to mean the timber in the built-in elements, which as elements of the structure, also when exposed to moisture, change their dimensions to a small extent, that they retain their full usefulness. These are usually glued laminated timber elements, e.g. windows.

"Timber that does not keep its dimensions", when the humidity changes, it can experience significant changes in shape and dimensions; they are subject to design tolerances. Sample items: wall cladding with tongue and groove boards, roof truss, etc..

What types of coniferous wood are used for the manufacture of external elements, which must maintain constant dimensions?
For the production of external elements with constant dimensions, except pine and spruce, other imported softwoods are also used, like Pitch Pine, Red Pine, Oregon Pine (Douglas fir), Red Cedar, Red Wood i inne.

What types of coniferous wood are poor in resins?
The resin-poor species include Spruce and Red Wood.

Please list the species of deciduous trees, of which wood is used in external building elements with fixed dimensions.
Wood from the following species of deciduous trees is suitable for the production of external elements with fixed dimensions: oak, mahogany, Red Meranti, aphromosis, Afzelia, azobe i tek.