Protection layer for glass substrates

An apparatus, comprising:

• a first tray stacker for housing a first plurality of trays, wherein each tray of the first plurality of trays is configured to hold a plurality of package substrate units;
• a second tray stacker configured to hold a first plurality of empty trays;
• a first conveyor between the first tray stacker and the second tray stacker;
• a robot configured to retrieve package substrate units from a tray on the first conveyor;
• a coating system configured to apply a coating along an edge of the package substrate units, wherein the robot is configured to transfer the package substrate units to and/or from the coating system;
• a third tray stacker configured to hold a second plurality of empty trays;
• a fourth tray stacker configured to hold a second plurality of trays, wherein each of the second plurality of trays comprises a plurality of coated package substrate units;
• and
• a second conveyor between the third tray stacker and the fourth tray stacker, wherein the robot is configured to transfer coated package substrate units to second the plurality of trays on the second conveyor.

A method, comprising:

• applying a liquid adhesive to an edge of a substrate that comprises a glass core with a first buildup layer over the glass core and a second buildup layer under the glass core;
• scraping a portion of the liquid adhesive from the edge of the substrate;
• and
• curing the liquid adhesive to form a solid layer.