Decided to re paint my walls from magnolia to white. Did the edging first then the rest. Walls seem to be ok but my god the edging is a horrendous mess. It's quite neat for the first time I've done it but the paint and wall itself is so patchy. I've done extra layers and it's still not looking at better. I've attached a picture to hopefully get some ideas of why it's gone wrong around the edging. (I did forget to mix the paint, but have since done this everytime I've used it and like I say walls seems to be ok)