After some recent failures of a couple of brands of Aluminium Composite Panel I have been told by one supplier that any warranty is null and void is used within 1km from the sea (among other conditions).
In Tasmania, many sign writers and businesses are close to the sea, so this is a big deal.
Many suppliers boast a 10 year warranty but that can be e.g.. only against delimitation as in the case of Signbond.
Aluwell is another brand where the warranty is useless.
Probond seems to have a good warranty.
I wonder how many tradesmen and women in the sign industry have considered these problems?