Corrugated Plastic vs Polyboard Signs: Which Material Should You Choose

When choosing custom yard signs for your next campaign, event, or business, the material you pick matters a lot for how long your message lasts and how good it looks. The two most common yard sign materials are corrugated plastic and polyboard. Each has its own strengths for different projects. Here’s how to pick the right one for your needs so your sign works as hard as you do.

Corrugated Plastic vs Polyboard: What’s the Real Difference?

Corrugated plastic (sometimes called Coroplast) is a rigid, weather-resistant plastic sheet that handles wind, rain, and sun for months at a time. Polyboard is a paperboard sign with a plastic coating, good for quick, budget jobs but less able to stand up to tough weather.

If you need an outdoor sign for more than a couple weeks or want to reuse it later, Legit Fast Printing recommends corrugated plastic every time. But for a one-day sale or event with a tight budget, polyboard works well enough.

Quick Comparison Table

Feature	Corrugated Plastic (Coroplast)	Polyboard
Material	Fluted plastic (polypropylene)	Poly-coated paperboard
Durability (outside)	1-2 years	A few weeks-months
Waterproof?	Yes	Moisture-resistant, not waterproof
Rigidity	Rigid and lightweight	Less rigid, more paper-like
Best Use	Campaigns, business, events, reuse	Short promos, sales, indoor use
Cost	Low per month of use for outdoor	Lowest for a very short term

Corrugated Plastic Yard Signs: Definition and Benefits

Corrugated plastic signs are made from fluted polypropylene—think of it like waterproof, lightweight plastic cardboard. The flutes (air channels inside) keep it strong but easy to move. This is the standard for most yard signs today.

• Withstands rain, snow, and strong sun
• Suitable for all weather and longer-term use outdoors
• Common thickness for yard signs: 4 mm (enough for H-stake mounting and rigidity)
• Easy to print full-color graphics and logos for custom yard signs

Polyboard Signs: When Are They Useful?

Polyboard yard signs use a heavy paperboard core and a thin layer of plastic for some water protection. They’re often used as fold-over signs for short promotions. Polyboard is not recommended for spots that get heavy rain, wind, or repeated handling.

• Fine for a short campaign, temporary directions, or one-day events
• Easiest to choose if you need a cheap, throw-away sign for indoor or semi-covered spots

How Long Does Each Material Last Outside?

• Corrugated plastic: 1–2 years in most outdoor conditions.
• Polyboard: Up to several weeks, sometimes a couple months if it doesn’t get soaked.

If you want something reliable through all seasons, corrugated plastic is the smart investment. It’s the choice for durable signs at Legit Fast Printing because it works for all types of weather and is strong enough for repeated use.

Best Uses for Each Yard Sign Material

When to Use Corrugated Plastic

• Political yard signs for weeks or months
• Real estate, business, and contractor advertisements
• School and church events outdoors
• Signs you want to store and reuse next time
• Larger signs for busy roadside or high-wind spots

When Polyboard Makes Sense

• Yard sales or parking signs up for just a weekend
• Indoor or covered entry signs for brief events
• One-day promotions where cost is biggest concern

Common Sizes and Practical Advice

• Standard yard signs: 24 x 18 inches is the top pick for visibility and cost. Good for lawns, intersections, or schools.
• Directional signs: 18 x 12 inches fits most curbside and parking uses.
• Large roadside: Signs as big as 96 x 48 inches get maximum reach on highways or busy roads. These should always use strong corrugated plastic, such as the Custom Printed Plastic 96" x 48" Signs from Legit Fast Printing.

Installation and Placement Tips

Corrugated plastic signs work best when mounted with H-stakes slid into the vertical flutes. For extra large signs on busy roads, T-posts, rebar, or backer boards provide the extra support you need. Polyboard signs (especially fold-over styles) are usually stapled or taped to a wire frame, but they can sag or wrinkle if left out too long.

• For curbside and lawn visibility, put your signs at least 18–24 inches off the ground.
• Use readable fonts and big, bold colors. Check out our guide on yard sign font sizes for best viewing.
• For events and sales, place signs at entry points and key routes drivers or pedestrians will take.
• If you’re worried about theft or damage on longer campaigns, avoid placing signs in spots with heavy traffic or unsupervised areas overnight.

Quantity and Order Recommendations

• Political campaigns: 100–500 signs for a city race covers most neighborhoods.
• School or nonprofit events: 25–100 signs helps boost turnout for fundraisers or celebrations.
• Business advertising: Many small businesses get great results from 10–25 signs posted at customer homes, partner locations, and busy corners. Need help planning? Read our advice for small business yard sign orders.
• Large roadside signs: Usually just 1–4, strategically placed to catch the most eyes.

Design and Artwork Tips

• Use high-contrast colors and limit your message to what’s truly essential.
• Pick fonts designed for distance readability—avoid script or thin type.
• Don’t shrink your text: at least 4-inch-high letters for passing cars.
• Use your logo, mascot, or a QR code, but keep it simple so nothing distracts from your message.
• If you need help, Legit Fast Printing’s team reviews every design before printing and can adjust spacing, scaling, and centering to help you stand out.

Simple Steps: How to Order the Right Yard Signs

1. Decide your goal: Is this for a one-day event, a multi-month campaign, or repeat business use?
2. Pick your material: For reliable outdoor use or if you’ll reuse, corrugated plastic is best. For quick, disposable needs indoors or for a weekend, polyboard could save cost.
3. Select your size and quantity: Use the guides above, or contact the Legit Fast Printing team for personalized advice.
4. Order: Upload your design or get fast design help to finalize your art.
5. Install with care: Make sure you have wire stakes or mounting hardware appropriate for the type and size of your sign.

Best Practices for Yard Sign Ordering

• Always proof for typos, dates, and phone numbers before placing your order.
• Don’t overcrowd your sign with information—keep it memorable at a glance.
• Order a few extra signs to cover for damage, theft, or unexpected placement needs.
• Keep climate and installation surfaces in mind: for wet or windy spots, corrugated plastic is essential.
• Plan to remove and store corrugated plastic signs to reuse for future events and promotions. Clean, dry storage will extend their life.

Frequently Asked Questions

Summary: What Should You Choose?

For reliable, weatherproof yard signs—especially when your event lasts more than a weekend—corrugated plastic is the clear winner. It’s the standard for outdoor signage, giving your message the staying power it needs. If you only need an indoor or brief outdoor sign for a sale or parking spot, polyboard can be a quick fix that keeps costs low.

Remember, your sign is your message delivered 24/7. A little extra spent on durable corrugated plastic from Legit Fast Printing means you won't have to replace signs halfway through your campaign or event. If you’re ready to order or have questions on size, quantity, or design, reach out to our team—we’re here to make your next yard sign project easy and effective every step of the way.