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Polyurethene or polysulphide, ie a setting 'rubber' sealant. Not silicon, oil based mastic or any non-setting mastic. Trade names.....Arbokol 1000, Sikaflex 201 etc, or look in you DIY store for the polys mentioned above. Mask up both edges, gun in, tool smooth, remove tape straight away, pulling over the bead, not away. |