The synthesis of reversible hydrophobic nanocomposite coatings was carried out by mixing SiO2 nanoparticles with a fluorinated polylactide and applied by a simple procedure on stone surfaces. The coating showed hydrophobic properties, reaching a maximum static contact angle of 137 on stone. This behavior was ascribed to an increase of surface roughness (as confirmed by AFM). Water vapour permeability and capillary water absorption confirmed the efficacy of the hydrophobic treatment. Finally, we have been able to remove the coating applied on stone surfaces by using an organic solvent. Therefore, these coatings may be used for temporary and reversible applications on building materials.