3D Box Up E.G. Lettering Sungai Petani Kedah

3D Box-Up Stainless Steel, EG Plate & Aluminium Signboard – Engineered for Coastal & High-Humidity Environments

Living near the coast or in Malaysia’s high-humidity regions is beautiful – until you see what salt-laden air and constant moisture do to ordinary signage. Standard aluminium oxidises (white rust). Mild steel rusts through within months. Even some stainless steels pit and discolour. At Pikoh Design, we’ve engineered a 3D box-up signboard specifically for corrosive environments, using marine-grade stainless steel faces, properly protected EG plate returns, and corrosion-proof aluminium back panels.

At Pikoh Design, based in Alor Setar, Kedah, we are a signboard manufacturer and installer serving businesses throughout the state – including Langkawi, Kuala Kedah, and other coastal areas. We specialise in corrosion-resistant 3D box-up signboards that combine 316 stainless steel (marine grade), zinc-protected EG plate, and aluminium in a system designed to withstand salt spray, humidity, and tropical downpours.

The Science of Corrosion Protection in Our Signboards

Each material in our hybrid signboard plays a specific role in fighting corrosion:

Stainless steel faces (Grade 316): Contains 2–3% molybdenum, an element that resists pitting corrosion from chlorides (salt). This is the same alloy used on boat fittings and seaside architecture. The brushed finish also hides minor water spots.
EG plate returns: Electro-galvanising applies a thin, uniform zinc coating to the steel. Zinc is sacrificial – it corrodes preferentially, protecting the underlying steel. We then add a powder-coated top layer (minimum 80 microns thickness) for additional barrier protection. In coastal applications, we recommend a two-coat system: epoxy primer plus polyester topcoat.
Aluminium back panel: Aluminium naturally forms a passive oxide layer that stops further corrosion. Unlike steel, it does not rust. Even if the powder coating scratches, the aluminium underneath remains stable.

Additional Corrosion-Resistant Features

We don’t stop at material selection. Our fabrication process also matters:

Welded seams are passivated (acid-treated) to remove heat tint and restore corrosion resistance.
All fasteners are 316 stainless steel – no mixed metals that cause galvanic corrosion.
Silicone seals between letters and back panel prevent moisture wicking.
Drainage holes (tiny, hidden) allow any condensation to escape rather than pool inside letters.

Perfect for Coastal & Humid Environments

Langkawi resorts & beachfront hotels: Signage that survives sea breeze without rust streaks staining your facade.
Kuala Kedah fishing port & jetties: Heavy-duty building identifiers for marine-related businesses.
Penang & Straits Settlements shoplots: Heritage buildings near the coast require corrosion-resistant signage that respects architectural aesthetics.
Swimming pools & water parks: Chlorine vapour is surprisingly corrosive – our 316 stainless steel resists it.
Aquariums & seafood restaurants: High humidity + salt + organic matter – a brutal environment that our signage handles.
Cold storage & food processing facilities: Constant condensation and wash-downs – our sealed, corrosion-resistant construction excels.

Materials & Customisation Options (Coastal Focus)

Faces: 316 stainless steel (marine grade), brushed finish (standard) or mirror (requires more frequent cleaning to maintain).
Returns: EG plate with heavy zinc coating (20/20 specification) plus two-coat powder coating (epoxy primer + polyester).
Back Panel: 5052 aluminium (marine-grade aluminium alloy) with clear anodised finish.
Fasteners: 316 stainless steel screws, studs, and washers – no exceptions.
Sealing: Silicone gaskets between letters and panel; sealed wiring entries (even for non-lit signs, to prevent moisture ingress behind letters).
Letter Depths: 60mm–100mm – deeper letters allow better drainage and airflow.
Warranty: 7-year corrosion warranty on 316 stainless steel faces; 5-year on EG plate returns (with proper maintenance).

Maintenance for Coastal Signs

Even the best corrosion resistance benefits from care. We recommend rinsing your sign with fresh water every 2–3 months (more frequently for beachfront locations) to remove salt buildup. A soft cloth and mild detergent keep the stainless steel faces pristine.

Protect your brand from the silent destroyer – corrosion. Contact Pikoh Design for a coastal signboard consultation with marine-grade specifications.