How do I install the self-adhesive underlay?

The underlay has a peel-off film on both sides. Place the dark black film (underside) on the substrate treated with SBS primer. First roll out the roofing membrane where it will be installed and position it properly. Roll it back up halfway, then carefully cut loose the film on the bottom. Pull off the film while unrolling the roofing membrane with your foot. Then do the other side.

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