Cane chairs feature a woven seat made from the rattan reed. These seats are constructed through either a hand-woven or a machine-woven process. The cane-seat chair has been a stable throughout much of history and is designed to be durable. Over time, seats that are not properly cared for will begin to sag. Unfortunately, a sagging seat becomes weak and makes the seat susceptible to breakage. The key to repairing minor sagging issues and keeping cane chairs strong is to regularly hydrate the surface.
Fill a bucket halfway with hot water. Fill the bucket the rest of the way with room-temperature white, distilled vinegar. The moisture and the acidity of the water-vinegar solution naturally tightens cane fibres, fixing sags and keeping the cane chair seat taut.
Line the bottom of a bathtub with cotton towels. Turn chairs upside down over the bathtub. Rest the chairs on the edges of the tub.
Soak a natural sponge in the water-vinegar solution. Squeeze the sponge over the cane seat bottoms. Allow the excess solution to drip through the holes in the cane onto the towels in the bottom of tub.
Remove the towels from the bottom of the bathtub. Dip the towels into the water-vinegar solution. Place the wet towel over the bottom of the cane seat. Allow it to sit for about three hours.
Remove the towels from the seat bottom. Place the seats in a warm, dry location to dry completely.