Bob Vila Radio: For No-Hassle Decorative Painting, Use a Dual Roller
Whereas many other decorative painting techniques can only be mastered through experience, a dual roller brings unique, arty effects within reach for even novice do-it-yourselfers.
Want to add a designer touch to your next interior paint job? One option is to experiment with a dual roller, a tool that weaves together two colors of paint in unpredictable, arty ways.

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Listen to BOB VILA ON DUAL-ROLLER DECORATIVE PAINTING or read the text below:
Dual rollers usually come as part of a kit that includes, besides the roller itself, a paint tray split down the middle to accommodate the different hues you’ve chosen to combine. To test the combination, it’s a good idea to first apply the roller to a large sheet of cardboard or, if you happen to have one, an extra panel of drywall.
Use diagonal strokes with the roller for best results. Less rolling produces more contrast between the colors; more rolling blends the colors. Roll as close to edges as possible, then use a trim brush and a sponge to blend the line.
If you compare the time, effort, and cost of wallpapering versus using dual-roller effects, it’s easy to see that, if you like the effects, dual rollers are the better deal. And perhaps the biggest plus is that if you don’t like the results you get with the dual roller, you can always just roll on another coat!