The plasticard stuff is good but it really depends on the finish.
Take your time in getting the painting right and it looks amazing, if it's not done right it can look really rough (as I've found out!)
There was a guy on ebay that was selling it in a tape form. Like rolls of electrical tape but it looked like shiny chequer plate. Not sure if it's still for sale there, that worked great for small areas (doesn't join seamlessly too well) with a spray of matte top-coat.
Alex