Ionic/Thermal hair straightening

[peterssi]

Hi,im from south africa, mixed race (african, indian, white), my hair is chemically relaxed, past shoulder length but i want to know if anyone has ever used japanese straightening systems like bio ionic retex or one n only on the actual relaxed hair (and not only on the virgin hair), i know it says not recommended but i would like to know who has done it and what was outcome. Thanks, Sil