Exterior use of limebased plaster Marmorino Dilavato

When you work outside with lime-based products, one of the first things to consider is the pigment’s resistance to UV rays. The natural pigments are all resistant to the sun’s rays, but a majority of the modern, synthetic colors are not resistant to sunlight, and will, therefore, alter.

Lime-based products are naturally resistant to mildew and molds because of their high PH. But acid rain caused by air pollution will change the natural PH of lime in a few years’ time, just as it does with cement, allowing for the growth of molds on external plasters.

Even in cold climates, lime-based products can be applied, but only if there is an over-hanging roof to protect against the rain. There are, after all, traditional outdoor lime-based plasters which can be found in countries with colder climates.