Another scratch-resisting option is to use a textured or embossed film, which won't repel scratches but may hide them. Extreme Temperatures Under normal conditions, you should never have to worry about heat or cold affecting your outdoor prints. But if the temperature goes above 100 or below 0 for an extended period of time, you might encounter problems. For instance, some films become brittle under very cold temperatures, and could crack if handled roughly. Also, if water seeps into a print and freezes, cracking and delamination can occur.
Heat is an even worse enemy of prints.
Adhesives can get soft, causing film to slide off, under extreme heat over long periods of time. Similarly, high heat can sometimes cause films themselves to get soft and oozy, affecting the clarity. In general, polyester films hold up better under heat than vinyl. Another potential problem with both heat and cold occurs if you use a film on the back of an encapsulated print with a different expansion coefficient than the film on the top. Then, if it gets hot or cold, one side will expand or contract more than the other, causing the print to curl up toward the short side.