We use the Nail Board seam on larger surfaces.  Sometimes it is not practical to use a piece of aluminum.

Flatten one side of the ice you intend to fuse with the Nail board.  A circular pattern works well

Video of the nail boarding action

Next, flatten the other surface

Video of the nail boarding action

Flip one surface onto the other.

Fill a large syringe with cold water

Separate the ice with a screwdriver

Squirt lots of water into the seam using the syringe. See A Video

 If your ice is below 15 F you will need to modify this step (add water more slowly)

Quickly remove the screwdriver & watch as the water squishes through the seam.

Video of the nail boarding action

We used the Nail board method to create most of the seams in this sculpture for Nike

Video of the nail boarding action