yeah the walls are 7 meters by 3 meters.I've used Durafinish quite a bit. On small walls it's OK as the second coat needs to go on almost straight after the first. You have to trowel it as level and flat as possible cause its a pig to get lines out later. It can be sponged in small areas but go gently or it just drags.
I did my neighbours with the stuff as they wanted an 'urban concrete' (she is a designer don't ask) look to the place.. Ive seen it now its all done and it does look like smooth cement on the walls as they havnt painted it. One of the walls I did was 12m long and 3m high which I did with one coat.. Nelaflex and sponge came in handy then..