If you use Oracal products, a cold laminator will fit the bill. Talk to Adrian (signco) on these boards about an easy taper. I have one, and they are perfect for use with the matched oracal substrates.
Graphytip, I am told, needs to have the laminate heated before applying. There are some cheap laminators around, an australian brand called emseal is probably a good starting point.
Avery (here in OZ) don’t reccommend laminating their 1005 material if it is being applied to convex or complex curves. Instead they suggest the end product is sprayed with a waterbased laminate once the job is applied.
If you are using a full solvent machine, a laminator is less of an issue, but an eco solvent prin does require lamination if you want to get the best life out of the job.
I started with an eco sol unit, and upgraded to a solvent version within months, because I did not have a laminator. Now I have an easy taper, I have the best of both worlds.
I don’t laminate stickers or car magnets usually, but I alway laminate half or full wraps. You’ll find most customers would expect a few years out of a digital print, and supplying one unlaminated to a vehicle that may be washed with harsh chemicals, would be a bit risky.
Hope that helps
Shane