Re: reupohlstering bowrider
The cushions will looks a whole lot better if you sew them out of two pieces of vinyl, and use cording. These are pretty easy to make, since when you staple them to the plywood, you can fix a lot of defects in the vinyl cover.
You need to cut vinyl for the coording, and sew a piece of line or twine inside it. I cut exact 1.5" wide strips of vinyl and put a 1/8" nylon string inside. It helps if the sewing machine has a cording foot. Now cut the vinyl for the "face" of the cushion, exactly the width of the cording larger than the foam on all sides. Cut the vinyl for the sides of the cushion to be the thickness of the foam, plus an inch or so to staple, plus the width of the coording. You will need a heavy duty sewing machine plus nylon coat thread. I used some light staples to hold stuff together while I sewed. Now, sew the cording to the side piece of vinyl, tight to the line part. Now sew the face of the cover to the side and cording piece, sew the ends of the sides and turn it rightside out.