Best and Economical Way to Mirror Tint a Visor on a Thomas Helmet?

[LordAdamMaster]

Hi everyone, does anyone know an economical way to mirror tint a Thomas Helmet Visor similar to the looks of a Transition or Grammys 2014 styled helmet? Thought about opting to go with window tint film, but another member here used something similar and notices that the tint began to bubble up the next day after he applied it to the PETG Sheet and onto the helmet.

[Artyom]

order the mirror window film, it works just be very careful, I've done it before. Had to order it all the way from korea
EDIT: you want a better quality one, bad ones probably would bubble up. Also heat it a bit when you apply it or ask somebody for help