Improvements in or relating to transparent units such as glazing units which may also be referred to as insulating glass units and their methods of manufacture. Each transparent unit comprises first and second panes of transparent material each having an outwardly facing side and an inwardly facing side, each inwardly facing side is at least partially coated with a reactive interlayer made by theapplication of a reactive interlayer coating composition. The inwardly facing side of said first and second panes of transparent material are spaced apart partially or totally by a transparent spacermade of a pre-cured condensation curable material or a substantially pre-cured condensation curable material adhered to the inwardly facing side of said first and second panes of transparent materialby way of said reactive interlayers. Preferably the pre-cured condensation curable material is a silicone based material.