Shop for Fluted Polypropylene sheets. Fluted, twin-wall corrugated plastic boards are a good choice for short-term outdoor signs because of their UV and moisture resistance. Fluted boards are lightweight and easy to fabricate. Typical applications include temporary signage (retail, real estate, and political signs), trade show displays, packaging, automotive liners and partitions, and temporary industrial applications. Custom cuts. Many colors. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote or learn more about Fluted Polypropylene.