Patelai Corrugated Plastic Sign Boards 24 x 36 in Black — 12-Pack, 4mm Waterproof Double-Sided Posters

These are 12 black corrugated plastic sheets (24 x 36 inches, 4 mm) designed as a double-sided, waterproof blank poster board for temporary indoor and outdoor signage and crafts.

If you need a stack of sturdy, lightweight boards for yard sales, temporary real estate signs, classroom projects, or event displays, this Patelai set gives you a versatile blank surface that resists light weather and is easy to customize. Each sheet is double-sided and smooth for markers, paint, vinyl, or adhesive letters, and the 4 mm fluted construction balances durability with portability.

How weatherproof and durable are these corrugated poster boards?

These Patelai boards are made from corrugated plastic that repels water and tolerates sun exposure better than paper products. They work well for short-term outdoor use like a weekend sale or event, but are not intended for permanent, heavy-exposure installations.

• Waterproof fluted plastic construction prevents sogginess and warping.
• Sun-resistant surface holds up for seasonal or short-term outdoor use.
• 4 mm thickness provides light rigidity while remaining easy to carry.
• Double-sided smooth faces for clear graphics and legible writing.

What customization methods work best on these boards?

These blank boards accept paint, permanent markers, vinyl lettering, spray paint, and adhesive-backed graphics with good results. Their smooth faces make colors pop and allow simple cutting, scoring, and shaping with basic hand tools.

• Paints and spray paints adhere cleanly to the flat surface.
• Permanent markers and acrylics produce crisp lines and text.
• Vinyl lettering and stickers stick well for short-term signage.
• Score and cut with a utility knife for custom sizes or shapes.

How easy is installation and what hardware fits these sheets?

Installation is straightforward—these boards are lightweight and compatible with common fasteners and sign holders. They fit many standard H-stakes and slip into typical yard-sign frames, and can also be taped, zip-tied, or stapled for indoor or fence-mounted displays.

• Works with most H-stakes and standard yard-sign holders for quick placement.
• Attach with zip ties, staples, or heavy-duty tape for fences and walls.
• Thin, flexible profile allows easy handling and temporary mounting.
• Pack of 12 gives multiple placements or backup spares for events.

What sizes and quantities come in the pack, and how does that help events?

The set includes twelve 24 x 36 inch boards at 4 mm thickness—large enough for clear visibility but small enough to transport in a car. The quantity suits larger promotions, multi-location yard sales, or classrooms that need supplies for several students.

• Twelve boards per pack for multiple signs or repeated uses.
• Each sheet measures 24 x 36 inches (60 x 90 cm), a common poster size.
• 4 mm (0.16 inch) thickness balances stiffness and light weight.
• Standard dimensions fit many commercial H-stakes and frames.

Who is this for? These Patelai corrugated plastic boards are ideal for event organizers, small business owners, real estate agents needing temporary signage, teachers, crafters, and homeowners hosting sales or parties. If you want an affordable, weather-resistant, and easily customizable blank canvas for short-term indoor or outdoor displays, this 12-pack offers convenient value and flexible mounting options.