Concrete profiles are as cheap as chips here in thailand so you really aint got no excuse for not using them.
This stuff you drill a few holes in, then as your screwing the profile in you chuck a load of cement in behind it to get to stick aswell, keep the cement lean as you really do want to get the poxy thing to stick and it dont stick too good to walls that have already been rendered off, these look great if you paint them in a color to high light them, I shall nip down the concrete profile shop tomorrow to get some more pics of the stuff available.