Aqua 63 style strip is fitted into the window frame aperture using four cut lengths. It is important to create tight butt or notched joints to ensure high levels of window performance. Joints can be enhanced by the application of a small amount of silicone mastic. When fitted, it is necessary to notch the seal end. Returns to original shape after compression. Stretching and shrink back at corners avoided. Suitable for all main timber Low compression force helps ease window and door operation. Maintains weathering characteristics and resists compression set over a wide temperature range +70° C to - 30° C. Research has proved that AquamacTM Weatherseal gives high levels of sound reduction. Unaffected by paint stains, window and door types. Aqua 21 style strip is a seal which is fitted into the frame rebate (head and jambs) as three cut pieces forming a compresion or wiping seal. Size. 25 metre Length. (approx) Colour. White.