Outdoor materials must resist UV, moisture, and temperature change. Indoor materials do not need that level of durability; using outdoor-grade indoors can be unnecessary cost.
Outdoor requirements
Vinyl, laminate, and substrate choices for outdoor use are rated for exposure. Uncoated or indoor-only media will fade, curl, or delaminate when used outside. Check the product rating for exterior use.
Indoor-only options
Paper, uncoated vinyl, and some foams are fine for controlled indoor environments. They are often cheaper than outdoor-rated options. Using them outside will shorten lifespan and can void expectations.
Deciding factors
• Will it be in sun, rain, or temperature swings?
• Expected lifespan (weeks vs years)?
• Will it be handled or only viewed from a distance?
Common mistake
Using an indoor material outdoors to save money. Replacement and rework usually erase the savings. Specify the environment and let the printer recommend the right grade.