There's a lot of misunderstanding of trademark law...
If you buy a T-shirt and make yourself an iron-on Corvette logo and apply it to your T-shirt, are you committing trademark infringement?
No, because you're doctoring up your own personal property, and thanks to the 1st amendment not even GM can prevent you from doing that.
But suppose you buy a case of T-shirts, and use your iron-ons to create a case full of "Corvette T-shirts" to sell at a swap meet-- That would constitute infringement, because your customers 'may be confused' into believing they're buying an 'actual' GM/Corvette item, and GM licensees DO sell such things.
Now suppose some guy comes to me and requests that I laser a Corvette logo onto his leather cargo cover, which is essentially the same him doing it himself, but I'd make it look nicer-- If I do the job, AM I committing trademark infringement?