How to Replace Car Seat Foam
- 1). Remove the cloth covering the car seat. Some car seats have removable seat covers, while others have the cloth sewn over the foam. If the foam is inside a seat cover, simply unzip or unsnap the cover to expose the foam below. To remove the other kind of seat cover, use a small seam ripper to rip through the seams of the upholstery fabric to expose the foam.
- 2). Measure the thickness of the original foam. Add 1 inch to the thickness to determine how thick the replacement foam should be. Remove the foam from the vehicle and take it to a flat, clean surface.
- 3). Lay the original foam over the new foam. Mark the outline of the original foam onto the new foam. Make the new foam 1 inch longer on each side to compensate for shrinkage.
- 4). Cut out the foam with a sharp carving knife. Use a rotary cutter if the foam is too thick to cut with scissors.
- 5). Glue each piece of foam to the seat with spray adhesive unless the car seat has a cloth bag for the foam to slip into. Spray adhesive will help the foam stay in place along the sides and back of the seat.
- 6). Recover the seat in the upholstery fabric or seat cover.
Source...