The CFSprayer is a tool to dispense CF Pellets.
It'll spray 13 blocks of CF, on a flat layer mostly in the following shape :
If using a CF Sprayer to spray on a Scaffold it will replace the Scaffold with Construction Foam. So you can use a scaffold in combination with Construction Foam to create walls (etc.) without the need to break unnecessary, left-over construction foam.
The scaffolds are returned if replaced by construction foam.
As of 1.70, CF will cover and harden around placed cables, allowing one to hide ugly wiring with pretty CF walls. Note that this will not otherwise affect the effect of sprayed CF.