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Stelmax 1965 Gap Filler & Sealant is an easily applied PVC resin, pigment and plasticiser. It will gap fill and bond readily to form maintenance free joints of exceptional strength for rigid and plasticised PVC. Good adhesion can also be achieved when used with many porous substrates. 1965 is extensively used within the window industry for the installation of frames and attachments. 1965 has smaller gap filling properties than the 1961 product and would be used to provide a seal within the window frame.