Hardline Products 3" Series 350 Boat Registration Numbers Kit — Solid Blue, Marine-Grade Vinyl, USCG-Compliant

Hardline Products Series 350 is a 3" marine-grade boat registration decal kit in solid blue, made from 4‑mil UV- and fuel-resistant vinyl for durable, USCG-compliant hull identification.

Keep your vessel legal-looking and road-ready with registration letters and numbers engineered for the marine environment. This Complete Series 350 kit supplies factory-matched solid blue characters sized to meet U.S. Coast Guard readability rules while resisting sun, salt, fuel and abrasion. The decals install quickly and sit flat against fiberglass, metal, gelcoat and most painted surfaces—giving a painted-on appearance without the permanence of new paintwork.

How do these decals hold up against sun and fuel exposure?

The Series 350 decals use a UV-stable topcoat and chemically resistant inks so colors stay true instead of chalking or bleaching. The construction also resists gasoline, oil and common cleaning chemicals so spills at the dock won’t dissolve printed details.

• 4-mil outdoor marine vinyl with UV-protective coating
• Fuel-resistant formulation to prevent ink or adhesive breakdown
• Salt and abrasion resistance for long-term color retention

Will they stay attached at high speed and on rough water?

Hardline’s proprietary Super-Stick adhesive is designed to form a permanent bond with common hull materials, reducing lift at high speeds and preventing edge curl during wash-downs. Proper surface cleaning and firm pressure during application ensure the best adhesion and longevity.

• Pressure-sensitive Super-Stick adhesive for immediate bite
• Compatible with fiberglass, gelcoat, metal, SMC, painted wood and glass
• Tested to resist peeling under dynamic water conditions

Does the kit include enough characters for both sides of my boat?

This pack contains a full complement of letters and numbers sized for dual-side registration display. With four complete sets of A–Z and four full sets of 0–9, the 146-piece kit covers port and starboard requirements plus extras for state codes and decals that need replacement.

• Four sets of letters A–Z and four sets of numbers 0–9
• Total of 146 decals—ample for both sides and spare characters
• Designed to meet USCG and most state hull ID regulations

How easy is installation for a DIY operator?

Application follows a simple peel-and-apply routine: clean, align, and press. No special tools or professional installation are required, though taking time to properly clean and position each character improves the finished appearance and adhesion.

• Quick peel-and-apply method—no heat or solvents required
• Apply to clean, dry surfaces for best bond and appearance
• Can be trimmed or spaced to match your boat’s registration layout

Who is this for: The Hardline Series 350 kit is intended for boat owners who want a long-lasting, professional-looking registration display without repainting or custom lettering. It suits owners of pontoons, center consoles, PWCs, jet skis, skiffs and aluminum boats who need USCG-compliant, UV- and fuel-resistant identification that installs easily and endures seasonal use.