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Shutter caps, if used, should also be painted, as the top edges of shutters are especially vulnerable to penetration by moisture. An opaque paint finish also prevents sunlight from breaking down the wood fibers over time. Exterior wood shutters may also be stained, however, if you want a natural wood look. In this case, you should take care to choose products especially formulated for exterior or marine use. The drawback is that stained window shutters require periodic care and refinishing to keep them attractive.