Guys 1 recommandation...
Get the lifetime warranty from the manufacturer of their film not the company!! Alot of shops would offer this with through their own company and their work, but after a couple of years they shut down and there goes your warranty.
Or find a shop that has been around for a long time like my buddy's shop, so you would not be afraid of them jumping ship when you run into trouble.
With the lifetime from the manufacturer of the film you are better protected, if shop goes under you call the warranty number on the warranty paper to locate another shop that would provide service of the warranty. Ask the shop on their lifetime warranty is from the shop or from the film company, if it is from film company you want to see the paperwork (locate a warranty contact number of the manufacturer) that shows this before handing them the keys.