keeleydavis said:
Anyone ever try sewing a vinyl seat by hand? I don't have a machine but I do have a lot of patience.
Quite often actually. Along with welting, windshield trim for vintage cars/trucks, various leather repairs, tractor seats, steering wheel covers...
I have an upholstery capable 1928 White Electric sewing machine, that I don't know how to use. So I just hand sew pretty much every project that comes along.
Glover's needles are a good idea. Pliers are optional with high quality needles. If you are stitching a pattern through a hard under layer ( like the variable thickness rubber on my race type seat) pre-drill your stitch holes in the base layer with a 1/16" bit.
Hancock Fabrics sells marine type black vinyl for $5 a yard, outdoor spec thread is around $4 per spool. Jo-ann Fabrics sells multiple colors and weights of vinyl, as does Pacific Craft. You can get the materials online as well, but shipping adds up quickly.
Lay out all your stitch lines in advance with a super fine sharpie or similar. Do all your stitching with the pieces face to face. Time consuming but you end up with tighter stitches by hand as opposed to with a machine.
Worst is Willie & Max saddlebags. Tear them apart, make your contrasting color welt or matching color welt to roll the front seam smooth like it should have been from the factory. Sew the seams back together via factory stitch holes and the welt seam, turn right side out and reinstall the stiffeners. Compared to those, seats aren't that bad...
Finished quality is 100% determined by the care you put into the work. Method is pretty much irrelevant.