Q. If Bitumen Paint/Primer has been applied – how long before Cromapol can be applied? A Q. If Bitumen Paint/Primer has been applied – how long before Cromapol can be applied? A. Not ideal or necessary but you would need to leave for a minimum 6 months otherwise Bitumen would bleed through. Cromar2020-03-18T16:21:10+00:00 Share This Product. FacebookTwitterWhatsAppEmail