Interior Painting Tips - Wagner introduces the revolutionary new Smart Edge Roller. Fast, clean trimming around windows, doors, mouldings and cabinets is easy with the Smart Edge Roller. Paint trays, paint buckets and left behind paint marks become a distant memory. Now you can shorten your painting projects and get a smooth roller finish right to the edge every time. The Smart Edge Roller is compatible with all lay techs or water-based paints and stains.