Q. Can cromaprufe be blinded with sand and then slate (or any other) tiles be laid with an adhesive? A Q. Can cromaprufe be blinded with sand and then slate (or any other) tiles be laid with an adhesive? A. No – a concrete screed must be laid over the top first – then the tiles fixed with an adhesive Cromar2020-03-18T16:42:26+00:00 Share This Product. FacebookXWhatsAppEmail