1. Using a marker determine roughly where you want your bulkhead to go. Be sure to leave enough space for the bulkhead from the aquarium edges and trim.
2. Orient the tank such that the hole is on the top and make a dam of clay around the area to be drilled. It’s a good idea to put just below the hole a catch bucket for the glass piece and liquid/carbide.
3. Add a few spoonfuls of carbide powder into the dam along with some water. You want a soupy mix.
4. Using a steady hand or drill press with the proper drilling bit, begin to spin the bit while applying pressure. You should hear an extremely loud and high pitch grinding noise.
5. Continue applying pressure while spinning the bit, occasionally lifting the bit a very small distance up to allow more of the carbide cutting powder to fill into the cutting trench you’ve created.
6. Continue until you see the water/carbide mix begin to pour out and keep applying pressure/spin until the hole is completely made. The amount of time needed to drill your aquarium will be dependent on the glass thickness, the speed of your drill, and the pressure you apply. Keep in mind too much pressure will break your glass.