Painted newly plastered wall with vinyl silk - next day could see every brush stroke

Chances are the colour was an unforgiving one. it sounds like to brushed the walls ? im unsure if im reading this correctly. with newly plastered walls you must give at least 3 coast ( depending on colour). 1st coat should be a very watered down mix, apox 30-35% water. this coat will suck into the new plaster. after about 24 hours- you can then apply the other two coats. if its emulsion, which i gather it would be.. use about 5-10% water mixed in.. again depending on colour. 1. do all your cutting in first.. ceilings,windows, door frames etc 2. then using a medium pile roller you can get a nice even finish. 3. when rolling don't forget to "backroll" with your dryish empty roller. this will remove any "tramlines" or roller marks you may have initially applied to the surface when the roller was full of paint. 4. When rolling: load your roller and roll from bottom to top.. if done the reverse the roller sleeve (which is full of paint) could gather like a sponge and in effect wring out the sleeve and cause paint to fall to ground. 5. cut in, roll top to bottom, back roll, reload and begin again. Hope this helps, Sean.