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The grommet panel must be a minimum of 70 inches wide, between the side hem seams, to provide just slightly more than 1.5 times fullness on the 40-inch space.
Once your hooks are up, hang your curtains on the grommets, spray the waterproofing spray on each side of the panels, and allow the panels to dry. Now we need to make curtain tiebacks to keep the panels pulled back.