SPGLUE is a silicone based glue to fixate a sensor spot at the inner side of the window and to glue SPADBAS fiber adapter to the outside of the window. The glue need at least 12 hours (if possible overnight) to dry. Ensure good ventilation as acetic acid is released during drying. Generally, every transparent silicone glue based on acetic acid can be used for this purpose. The actual delivered brand of silicone glue might differ from the product image.