Hi. Can anyone offer any help? We've had new plaster on all of our walls. A mist coat of cheap 50/50 watered down paint was applied. I am now on the 3rd coat of good paint but the finish is patchy. I've used a good brush as my wife wasn't happy with the dimpled effect of a roller. I am now looking at applying a 4th coat but would like to know the best way of going about this as I do not want to go for a 5th if this one dosn't come up to scratch. Can anyone also tell me if it's wise to use a gloss roller for emulsion for a smoother result.