Se han modificado, mediante el empleo de diferentes plas- tificantes, las características de productos comerciales que normalmente presentan defectos de cuarteado por exposición al exterior. De esta manera se logra una durabilidad satisfactoria en lapsos superiores a 24 meses. El plastificante más eficiente es una resina poliéster, que se incorpora en presencia de un agente emulsivo. Se observa que su empleo reduce marcadamente la permeabilidad de la película y mejora la resistencia a la intemperie de la misma.

The domestic commercial products for this use tested in a previous work usually had cracking deffects. They were modified using different plasticizers. In this way, an outdoor resistance of more than two years was obtained for some of the samples. The most efficient plasticizer is an alkyd resin which is incorporated in the presence of an emulsive agent. The employ of this plasticizer reduces the film permeability markedly and improves its water resistance.