Has anyone used a Dulux Weathershield Easyspray Sprayer . It's say that you only use weathershield easy spray paint with this, but would it still work ok if l use normal dulux weathershield paint as the easyspray comes in only 5 colours and not the colour l need. The reason l was thinking of using the easyspray sprayer is my exterior walls are rough pebbledash and very hard to get the paint into with a roller.