I personally think the heat, and inside out roll-over works very well. I did the entire interior of my '62 VW Bug with vinyl, and it worked find without plastic. If your seats were to ever get wet, that plastic will hold in moisture to no end, leaving the plastic out will at least allow your seats to breathe some. Take some time, and use some muscle, and even the toughest seats will be worth the effort. IF i do recall, no seats in history ever had the plastic installed like this from the factory! Imaging pulling upholstery all day long in a warehouse!
Just my $.02!
Thanks,l
John


John
[email protected]
If you are interested in my '66, make me an offer! I also like doing work, and if you need some done, let me know! Tecnically I live in Southern California, but not for much longer, going back to the MidWest!