DuPont formulated its Tyvek Fluid Applied Flashing to be brushed onto rough openings of residential windows and doors. The low-VOC vapor-permeable membrane requires only one coat and can be gunnedonto the surface and brush-ed into place when it’s as low as 25 degrees. The coating can handle nine months of UV exposure, its maker says. DuPont, 800.448.9835; dupont.com.