Best to use a sheepskin roller,buy the best you can afford.Usually a 7 or 9 inch is big enough for most ceilings. Dont apply to much pressure to the finish strokes as this will cause lines from the edge of the roller to form. Your right about the wet edge, do a meter square at a time. Dont overload your roller and spread the paint as evenly as possible. Silk paints need more care when applying as the finish can show more imperfections. If your new to painting, stick to matt paint for your first few goes, its more forgiving. Hope this helps. Wash your sheepskin roller out with warm(not hot) water realy well and dry it by spinning it, Do this outside!!. A good roller will last for years!!
rob
August 2008
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