Dacron wrap will be added to the seat cushions and the back cushion to fill in any nooks and crannies, give a nice crown on top and slightly overstuffed appearance.
1. Cut two pieces, 22" x 23.5" (seat depth and width +1", for a 1/2" overlap on all sides. Cut long strips 4" wide (easiest to use rotary and cut several at once) for the sides.
2. Wrap the 4" strip around the boxing and zip panels, securing with a very light spray glue. Add the top seat and bottom seat panels, securing with a very light spray of glue.
3. Cover the entire thing with silk film, seat back toward, you leaving generous extra at sides. Fold the film back at the center back and insert the vacuum hose and turn on. Carefully fold up the silk wrap around it and the foam immediately shrinks. Here's a video:
4. Insert the foam into the seat cushion and release the vacuum. As the foam expands adjust as needed so it's nicely centered. Reach in and remove the silk film and discard it. (It's possible to remove it in one piece and re-use it, but I don't think it's worth the effort.)5. Zip closed and it's done!