[Kevan]

Hydrofilm (aka hydro dipping)...not the best photo as this was on my old phone a couple of years ago taken late in the evening without decent light...(that's the excuses out of the way)

   
   

There's more designs than you could think possible. 

Hydrofilm comes on rolls but you can buy A4 sized 'samples' that are big enough to get two cars out of.

After a couple of other cars after this one I realised the best method was to put sellotape all round the edge of the film as a 'frame' as the film spreads as the backing solvent melts away.

Here's my notes on the envelope holding some film I have:

• sellotape edges to stop it spreading
  
• sticky side down (usually shiny side) test with a wet finger on a corner of the sheet
  
• water at 32°C
  
• let it soak for a minute until creases are gone and it's a flat film
  
• apply activator spray, one or two passes so the surface is shiny (activator is NASTY STUFF...use a well ventilated area)
  
• wait 10 seconds
  
• dip