For what reason is added to lime paints to 0,5% linseed varnish?
Thanks to the linseed varnish, the lime becomes more greasy, which allows avoiding streaks when applying subsequent lime coatings.
Why, using lime paints, only clear is obtained, pastel shades?
The lime binder can bind at most 5% pigments.
How lime paints harden?
In the chemical hardening process, lime reclaims carbon dioxide, which separated during its firing (calcium circulation). Chemical curing by adding carbon dioxide is referred to as carbonation.
What substrates are lime paints suitable for??
Lime paints can be used on all mineral substrates. The only exception are gypsum substrates, for which lime paints are not suitable.
What properties do lime paint coatings have?
Professionally made lime paint coatings are resistant to abrasion, washing and weathering. Because lime paints have poor coverage, as a rule you have to paint 3 or 4 times. The individual layers must be applied very thinly. Because lime paints are highly alkaline, until they are completely carbonated, they exhibit fungicidal and disinfecting properties.
Please justify, why painting the facade with lime paints is currently not advisable?
Lime paint coatings are very sensitive to environmental pollution. Sulfuric acid in the air displaces carbon dioxide from calcium carbonate. This is how the limestone layer turns into gypsum, which dissolves strongly in water and is washed away by rain.
This reaction follows the formula:
CaC03 + H2S04 -> CaSO4 + H2C03
Calcium carbonate + sulfuric acid = gypsum + carbonic acid