In construction, Hydrated lime (Calcium Hydroxide) is used as a pore sealant to reduce the consumption of paints in finishes and plasters, as a waterproofing of tanks and concrete slabs, it is used to whiten or paint households.
The hydrated lime mixed in mortars increases the manageability (plasticity), improves water retention, reduces the porosity of finishes, which facilitates its application in masonry.
In this industry is used to give fine finishes (stucco) to be mixed with pigments you get a reduction in the amount of paint necessary to give the final finish in the white work.