We quote both to our customers.
As per manufacturers, perf is generally only guaranteed for a year.
That having been said, it can last longer, both laminated and unlaminated on flat applications.
Some questions you should ask:
Is this a high traffic area?
If so, yes laminate and seal edges with tape this will protect from scuffing etc. If laminated edge seal IS mandatory.
Is it protected from intense elements?
If so you probably don't need laminate. Although I will dab 3m primer in corners and along edges. Don't go crazy.
Does it receive direct sunlight for the majority of the day?
In this case it depends on the intended duration, although not guaranteed over a year most business owners will expect longer, to prevent fading laminate and edge seal
Also if you'd like to achieve a more vivid print, a gloss laminate makes the print pop more.
And yes I suggest an optically clear laminate, however on flat windows a clear will also work, you can still see, however it will be slightly more hazy. Optically clear is a necessity for automotive installs for safety reasons.
It's a value added so offer the options. And listen to your customers, ask the right questions.
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