Use Zap-O Xtra just like you would any other CA glue. Simply add a little to one surface and mate it to the other. Hold the junction together for 30 seconds and you are done.
Not just for Foam. If you like building with wood, composites, plywood or spruce, Zap-O Xtra is a great option. Zap-O Xtra will bond woods from soft balsa wood to hard oak. With a viscosity between Zap-CA and Zap-A-Gap, modellers will find that this is a great glue for many applications.
If you are working in a dry environment or using materials that are extra dry like some open-cell foams, simply add a little moisture to one side of the foam before paring them together. Some of the foams are extra dry and adding a slight bit of moisture from a spritzer or damp rag will allow the glue to grab even stronger without the need for an accelerator.