Finance and Business What generation is OptiBond Solo Plus? What generation is OptiBond Solo Plus? fifth-generation How long to cure OptiBond? The OptiBond XTR Primer was placed on all prepared areas for 20 seconds and air-dried to evaporate the solvent. The OptiBond XTR adhesive was applied for 15 seconds and air-dried. The adhesive was light-cured for 10 seconds.Jan 31, 2011