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[ValerieJean]

The seatback pocket on the bucket seat I'm recovering in vinyl has a wimpy hem that will probably stretch and droop over time. I have an example of a stiff pocket hem in my F-350 that I'm trying to mimic without taking those seats apart. It seems to be plastic flat stock that slides in the hem as the hem is stretched during use. It gives enough to not poke through the hem at the ends but is stiff enough to keep a nice firm shape over 20+ years of use. I've tried a few things, such as flexible cutting board (too soft) to sail battens (too hard). Elastic will fail after a few years and can't be replaced. I tried sewing grosgrain in the hem so it would not stretch, but it seems the hem will still roll down with use. Any suggestions? Thanks.

[Dmitry_CAD]

Since a flexible cutting board is too soft and sail battens are too stiff (they distort the shape), you need a material with good "shape memory" that flexes but doesn't kink or snap. Here are the best options:

--- A strip cut from a plastic jug / gallon container (Free & Effective). Look for a heavy-duty plastic jug (like an empty motor oil, antifreeze, or laundry detergent container). Check the bottom for the HDPE or PE-HD recycling symbol. Cut a strip from the flattest side of the jug. It has the perfect thickness, won't crack in winter temperatures, and costs absolutely nothing. Pro-tip: If the plastic has a slight natural curve from the jug, orient it so it curves inward toward the seatback. This will pull the pocket even tighter against the seat.
--- ABS or HDPE plastic sheeting (1.0–1.5 mm thick). This is the closest thing to the factory OEM solution if you want to buy new material. You can get small sheets online or at car audio shops (where it’s used for custom speaker pods). It cuts easily with heavy-duty shears into strips of any width.
--- Plastic piping/welt (Keder or flat piping strip). Look for flat bag-making piping. It is made of PVC or polyethylene and is specifically engineered to hold the shape of bags and covers under constant load.
--- Hydraulic brake line tubing or heavy trimmer line (3-4 mm+). A great DIY option if you prefer a rounded hem. You just fish it through the hem. It provides excellent sag resistance while still allowing the pocket to stretch outward when used.

Why grosgrain didn't work (and how to beat the roll-down) Grosgrain ribbon prevents the hem from stretching horizontally, but it lacks structural rigidity. Without vertical stiffness, the vinyl will still roll downward under its own weight or when the pocket is pulled.To stop this from happening, do these three things:
-- Round off the plastic corners. Always cut the ends of your plastic strips into a smooth semi-circle and knock down the sharp edges with sandpaper. Otherwise, those sharp points will poke right through the vinyl in a couple of years.
-- Lock the insert in place. The plastic strip should fit snugly against the top and bottom of the hem pocket. Make sure to backstitch (tack) vertically at both ends of the hem so the plastic cannot slide left or right.
-- Pre-tension the hem (subtract 2-3%). This is the ultimate pro-tip: pattern the top edge of the pocket about 1.5 to 2 centimeters shorter than the actual mounting width on the seatback. When you stretch and secure the pocket during final assembly, the plastic insert will be under tension and physically won't be able to sag.