Hi all again, i have just painted my bedroom in dulux grey and i used a roller to apply, after the paint had dried i touched the wall up in places with a mini roller( only 4 small spots), only to find that when this dried you can see were i rollered it, so i decided to use a brush to go over the mini roller only to find that this is to the same effect, I only have dregs left in the bottom of the tub of paint now which would go over them one more time, does anyone know why this is happening????