Qlon Weatherseals Seals have been the quality choice for over 35 years. Durable, UV-resistant, polyethylene cladding in a variety of colors is permanently bonded to resilient urethane foam to make seals for outstanding sealing against air and water infiltration. The liner is exceptionally durable and extremely tough so paints and varnishes do not adhere to it. Additives in the liner inhibit the effects of UV light on Qlon weather seal and it cuts friction in half, for superior operating ease.