Remove dust, dirt, hair and any loose bits of existing glue.
Use only a little, but ensure a film goes right to the edges, onto one surface. on the shoe not the build You can always add more.
Clamp and hold it really tightly for about 7-30 seconds. The Atom needs to go all the way to the edge and there needs to be enough so that it just comes out the edge when you press it together. But no more.
Wipe up excess straight away .Once you have pressed the 2 pieces together, do not move them or pull them apart, as they then may not stick. If this happens dry both surfaces with a rag, regrind and start again. If still not sticking, leave clamped for 5 minutes