I've been playing a bit of Tekkit recently, and while looking up stuff on the IC wiki, I came across this paragraph here:
As of 1.70, CF [Construction Foam] can cover & harden around a placed cable, creating a block that functions as a cable but looks like a CF wall.
Would I like to cover up my ugly cabling with CF? Yes, please. This would also be great for patching up the weak spot in my nuclear reactor containment thing (output cable).
How do I actually do that, though? Placing CF on a cable doesn't work — it just places the CF like a normal block when I click on the cable (i.e., next to it, not covering it).