Hardline Products Series 400 Boat Registration Kit — 3" Silver with Black Outline, 146‑Piece UV‑Resistant Marine Vinyl Decals

Hardline Products Series 400 is a 146-piece, US Coast Guard–compliant boat registration decal kit featuring 3" silver fill with black outline, marine-grade vinyl, and a permanent adhesive for long-lasting, factory-style identification.

Give your hull an OEM-quality finish while meeting federal and state marking rules. The Series 400 kit delivers a full complement of letters and numbers sized to the legal 3-inch standard, crafted from a 4 mil marine vinyl with a UV-gloss topcoat and a specially formulated pressure-sensitive adhesive. These decals are engineered to resist sun, salt, fuel, and abrasion so your registration stays legible and looks integrated with your boat’s styling.

How does this kit meet US Coast Guard and state registration rules?

The characters are cut to the exact 3-inch height and use a high-contrast fill-and-outline design for visibility at distance. The package contains multiple sets so you can mark both sides of your vessel according to regulations and keep spares for replacements.

• Each character measures the legal 3 inches high for compliance.
• High-contrast silver interior with black outline improves legibility.
• Supplies include enough letters and numbers for port and starboard plus extras.
• Durable materials maintain visibility under sun and water exposure.

What surfaces will the decals stick to and how durable are they?

These decals are formulated to adhere to most common hull materials and hold up against marine wear. The vinyl is 4 mil thick and sealed with a UV-resistant gloss that combats fading, while the adhesive provides a strong, long-term bond.

• Works on fiberglass, gel-coat, aluminum and painted metal hulls.
• Adheres to polyethylene, SMC, and many plastics used on kayaks and PWCs.
• 4-mil vinyl plus UV gloss resists fading, scratching, and fuel spills.
• Proprietary pressure-sensitive adhesive minimizes lifting and edge peel.

How many characters are included and will I have enough for my boat?

The kit supplies 146 individual decals: four complete alphabets and four sets of digits 0–9. That abundance makes it easy to mark both sides of most recreational vessels and still keep replacements on hand for future damage or reconfiguration.

• 146-piece total inventory for full-port and starboard registration needs.
• Four sets of A–Z and four sets of 0–9 for flexible layout options.
• Extra characters let you reposition or replace without reordering.
• Block-style slanted font offers a factory-grade appearance.

How simple is installation and maintenance?

Installation is a quick peel-and-stick process—no solvents or hardware required—plus a few best practices ensure the longest life. Routine rinsing and gentle cleaning keep the decals readable and preserve the finish.

• Clean, dry surface recommended; avoid waxy residues before application.
• Apply pressure evenly and allow 24 hours for full adhesive set.
• Clean with mild soap and freshwater; avoid abrasive pads near edges.
• Replace individual characters as needed—spares included in the kit.

Who is this for: The Hardline Products Series 400 kit is designed for boat owners, PWC riders, marinas, and DIYers who want a compliant, long-lasting registration look with a factory-style finish. It’s ideal for people who need a full set of characters for both sides of a vessel, those replacing worn numbers, or anyone seeking a professional appearance without a custom paint job. If you value durability, legal conformity, and easy installation, this kit delivers a complete, dependable solution for registering and styling recreational watercraft.