Hardline Products 3" Boat Registration Numbers Kit — Solid Blue 146-Piece, USCG-Compliant Marine Vinyl

Hardline Products Series 350 is a complete 146-piece marine-grade vinyl boat registration kit with 3-inch solid blue characters built to meet USCG and state hull identification rules.

These pre-cut registration decals deliver a factory-quality look while standing up to sun, salt, fuel and high-speed water use. Designed for easy peel-and-stick installation, the Series 350 kit supplies enough letters and numbers to mark both port and starboard sides of most boats, pontoons, PWCs and jet skis. Every decal is made from a heavy-duty 4-mil outdoor vinyl with a UV protective finish and Hardline’s Super-Stick adhesive for a secure, long-lasting bond.

How will these decals hold up in sun and saltwater?

The Series 350 decals are formulated for harsh marine conditions without sacrificing legibility. A UV-resistant gloss keeps color from bleaching, and the vinyl resists salt corrosion and abrasion so characters remain readable season after season.

• 4-mil marine-grade vinyl with UV protective coating
• Chemically engineered to resist saltwater and abrasion
• Color-fast solid blue finish for long-term visibility

Are these numbers truly USCG and state compliant?

Yes — the kit’s 3-inch block-style characters meet common U.S. Coast Guard and state sizing and style requirements for hull identification. The bold, uniform font maximizes legibility from a distance, helping you satisfy enforcement and boating-safety standards.

• 3-inch block font chosen for legal visibility
• Includes multiple sets of A–Z and 0–9 for both sides
• Suitable for boats, pontoons, PWCs, jet skis and tenders

Will these decals stay stuck on different hull materials?

Hardline’s Super-Stick adhesive is engineered to form a strong, permanent bond to a wide variety of surfaces used in marine craft. Whether your hull is fiberglass, gel-coat, aluminum, painted wood or plastic SMC, the decals are made to cling and resist lift even at speed.

• Pressure-sensitive Super-Stick Adhesive for permanent bonding
• Tested on fiberglass, metal, gel-coat, painted surfaces and plastics
• Designed to resist peeling during washdowns and high-speed runs

How easy is application and what’s included in the kit?

Applying the decals is a straightforward peel-and-apply process — clean the mounting surface, align characters, press firmly and smooth out any bubbles. The kit includes four complete sets of letters A–Z and four sets of numbers 0–9, totaling 146 decals to cover both sides of most vessels.

• 146 total decals: 4 sets A–Z and 4 sets 0–9
• Simple peel-and-apply installation; no special tools required
• Factory-matched solid blue for a painted-on appearance

Who this is for: boater or fleet owner looking for a durable, compliant and professional-looking registration solution. Ideal for owners of bass boats, pontoons, runabouts, PWCs, jet skis and small commercial or rental craft who want a hassle-free installation and long-lasting visual identification. If you need USCG-compliant numbers that resist sun, fuel and salt while delivering a near-OEM finish, the Hardline Series 350 kit is designed for you.