Undrdog Marine Plus — the pro-installer marine coating

The short version: Marine Plus is Undrdog's professional-grade marine coating, engineered for detailers who install high volumes and need tight chemical-resistance targets and a faster flash time. It uses a single-layer application method — one pass, wipe off, done — while delivering elevated durability and gloss on gel coat, aluminum, fiberglass, and painted hulls.

Who it's for: Professional marine detailers running production installs, marinas offering premium detail packages, and experienced boat owners who prefer a coating tuned for a faster, more efficient install.

What sets Marine Plus apart from Marine

• Elevated chemical resistance. Higher acid- and alkali-resistance targets than standard Marine, so it holds up to harsher waterline environments — brackish water, industrial fallout, mineral-heavy dock rinses.
• Single-layer application method. Where standard Marine allows a multi-layer approach for owners doing their own maintenance, Marine Plus is designed to deliver its full performance envelope in a single wipe-on / wipe-off pass.
• Shorter flash time. Faster wipe-off window for shop production. Tighter than Marine — do not apply in direct sun.
• Heightened hydrophobicity. Water beads more tightly and sheets off faster.
• Increased slickness. Bird drop, dust, and pollen wipe off with less effort during between-trip rinses.

Verified specs

• Application method: Single-layer.
• Flash time: Shorter than Marine (humidity- and temperature-dependent). Watch the panel closely.
• Dry time: 24 hours.
• Full cure: 5 days.
• Compatible surfaces: Gel coat, fiberglass, painted aluminum, marine metals, vinyl, marine glass.
• VOC compliance: Yes (U.S. and Canada).

When to choose Marine Plus over standard Marine

• You install multiple boats per week and need production speed.
• Your customer's boat lives in brackish or heavily-mineralized water.
• You want elevated chemical-resistance on a hull that gets aggressive marine soaps or acid rinses during regular maintenance.
• You are experienced with tight-window coatings and can work efficiently in a covered install area.

If you are a first-time coater or your climate has extreme humidity swings, standard Undrdog Marine is the more forgiving choice.

How to apply Marine Plus correctly

1. Wash the hull with a marine-appropriate soap. Rinse until sheeting is even.
2. Decontaminate — clay or iron-remove any bonded fallout. Machine-polish oxidized gel coat before applying.
3. Wipe down with a marine panel prep to strip polishing oils.
4. Apply a section at a time with a coating applicator, working in a cross-hatch pattern. Do not overload the pad — Marine Plus is designed around a single-pass film build.
5. Flash until residue rainbows and is just about to feel tacky. Watch closely — the window is shorter than standard Marine.
6. Wipe off with clean, plush microfiber. Turn or replace the towel every section.
7. Cure under cover. Keep dry for 24 hours minimum. Full chemical resistance at 5 days.

Frequently asked questions

How is Marine Plus different from HCC on a boat?
Marine Plus is a PTFE-based marine-tuned coating optimized for gel coat and marine metals. HCC is a hybrid ceramic (SiO₂-based) all-surface flagship that also works on boats. Choose Marine Plus if you want a marine-specialized product; choose HCC if you want one coating you can also use on your car, motorcycle, or bike.

Can I stack Marine Plus over Marine?
No. If you want the Marine Plus performance envelope, apply it to bare, properly-prepped surface. Layering Marine Plus over cured Marine bonds only to the top of the existing film and does not add durability.

Is Marine Plus safe for DIY use?
Technically yes, but the shorter flash window makes it less forgiving than standard Marine. If you have not installed a professional-grade coating before, use Marine first.

How long does Marine Plus last?
Service life depends on hull environment, sun exposure, and wash chemistry. Marine Plus is engineered for extended multi-season service life on well-prepped gel coat with pH-neutral maintenance.

Can I apply Marine Plus on painted aluminum trailers, tow vehicles, or trim?
Yes, provided the surface is properly cleaned and decontaminated. It performs well on painted marine trailers, aluminum hulls, and rigid inflatable tubes.

Do I need to top Marine Plus with a maintenance spray?
Not required. A quick-detail marine spray between wash-downs extends slickness and gloss depth, but it isn't needed for the coating to work.

Is Marine Plus safe on soft goods (canvas, upholstery, isinglass)?
No. Marine Plus is for hard surfaces only. Isinglass and canvas need their own dedicated care products.

Referenced sources

• Engineering Toolbox — PTFE friction coefficients

Packaging may not exactly match featured images.