I’ve made little zipped toilet bags. When the shiny side meets my machine it doesn’t want to move so I just lift it slightly and all is well with the stitching - I use a teflon foot.
So the iron on vinyl is for cotton fabric to be made to oil proof Waterproof fabric? I have iron on fusible interfacing fabric for adding more umpfh to my cotton fabric but I guess it also works on oil cloth?