Sea Ark 18 Specifications
- Length Overall (LOA): 18'0"
- Beam: 6'10"
- Dry Weight: ~750 lbs
- Engine: Single outboard, 90 HP max
- Fuel Capacity: Portable tanks
- Draft: ~8"
- Hull Type: All-welded .100-gauge 5052 aluminum, 3° modified-V, extruded center keel
Cover Features
- Fabric Options: 9oz solution-dyed marine fabric or premium Sunbrella acrylic
- Coverage Type: Full center console cover enclosing entire boat including engine
- Construction: Reinforced stitching, hem cord at rubrail, adjustable tie-down straps
- Durability: Solution-dyed fabric (5-7 years); Sunbrella acrylic (8-10 years)
- Fit: Custom-fitted to 18'0" Sea Ark 18 specifications
- Protection: UV-resistant, water-repellent, weatherproof
Additional information
Choose Your Cover Fabric
7 oz. Polyester — Our entry-level marine cover fabric, woven from 100% polyester fiber at a 7 oz. per linear yard weight. This lighter option keeps the cover manageable for solo handling while still delivering reliable protection against sun, rain, and debris. Backed by a 3-year fabric warranty. Ships in Black.
9 oz. Polyester — Step up to our heavy-duty polyester, engineered at 9 oz. per linear yard for boats that face tougher conditions or extended outdoor storage. The denser weave adds an extra layer of defense against abrasion and weather without adding unnecessary bulk. Protected by a 5-year fabric warranty. Ships in Navy or Black.
Sunbrella® — For boaters who want the best, our Sunbrella covers use 100% solution-dyed acrylic — the same fabric trusted by marine professionals worldwide. Naturally resistant to fading, mold, and water damage, Sunbrella holds its color and integrity season after season. Covered by a 6-year fabric warranty. Ships in Black, Smoke, or Marine Blue.
Both polyester options feature solution-dyed construction, where pigment is infused into each fiber during production rather than applied to the surface afterward. This process locks color deep into the material, preventing any dye transfer to your boat’s gel coat or finish. The result is a cover that stays vibrant without bleeding or rubbing off. Our polyester is also designed to breathe — it allows moisture trapped underneath to vent out naturally, reducing the risk of mildew and keeping your boat dry. The fabric holds its form without sagging or stretching over time, stays lightweight enough for one person to handle, and stands up to prolonged UV exposure and harsh marine weather.
*The warranty periods above are provided by the fabric manufacturer and cover the material itself. For details on what’s included in the warranty for your completed cover, please see our warranty page.
7 oz. Polyester — Our entry-level marine cover fabric, woven from 100% polyester fiber at a 7 oz. per linear yard weight. This lighter option keeps the cover manageable for solo handling while still delivering reliable protection against sun, rain, and debris. Backed by a 3-year fabric warranty. Ships in Black.
9 oz. Polyester — Step up to our heavy-duty polyester, engineered at 9 oz. per linear yard for boats that face tougher conditions or extended outdoor storage. The denser weave adds an extra layer of defense against abrasion and weather without adding unnecessary bulk. Protected by a 5-year fabric warranty. Ships in Navy or Black.
Sunbrella® — For boaters who want the best, our Sunbrella covers use 100% solution-dyed acrylic — the same fabric trusted by marine professionals worldwide. Naturally resistant to fading, mold, and water damage, Sunbrella holds its color and integrity season after season. Covered by a 6-year fabric warranty. Ships in Black, Smoke, or Marine Blue.
Both polyester options feature solution-dyed construction, where pigment is infused into each fiber during production rather than applied to the surface afterward. This process locks color deep into the material, preventing any dye transfer to your boat’s gel coat or finish. The result is a cover that stays vibrant without bleeding or rubbing off. Our polyester is also designed to breathe — it allows moisture trapped underneath to vent out naturally, reducing the risk of mildew and keeping your boat dry. The fabric holds its form without sagging or stretching over time, stays lightweight enough for one person to handle, and stands up to prolonged UV exposure and harsh marine weather.
*The warranty periods above are provided by the fabric manufacturer and cover the material itself. For details on what’s included in the warranty for your completed cover, please see our warranty page.
| Weight | 23 lbs |
|---|---|
| Fabric | 9oz Polyester |
Install
Please watch the video below for installation instructions!
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Frequently Asked Questions
The Sea Ark 18 center console cover is available in 9oz solution-dyed marine fabric or premium Sunbrella acrylic. The 9oz option provides 5–7 years of UV and weather protection, while the Sunbrella upgrade extends coverage to 8–10 years. Both are water-repellent, mildew-resistant, and double-stitched.
Yes. The cover is designed as a single continuous canopy that peaks at the center console and slopes smoothly down over the entire boat, including the outboard engine. The console and engine are fully enclosed beneath the fabric.
Installation takes under five minutes. Drape the cover over the boat starting at the console, spread it evenly over the bow, gunwales, and stern, then secure the adjustable straps and buckles at the rubrail. One person can complete the installation without tools.
Yes. The cover is reinforced for highway-speed trailering with heavy-duty stitching and secure strap-and-buckle tie-downs that keep the fabric tight against the hull at speed. The Sea Ark 18's lightweight aluminum hull makes trailering easy.
Yes. The Sea Ark 18 center console cover creates a complete barrier over the entire boat, protecting the console, electronics, livewell, rod holders, and all deck hardware from UV damage, rain, bird droppings, and debris.
Every Sea Ark 18 center console cover includes a 2-year manufacturer warranty covering defects in materials and workmanship.
The cover is water-resistant with a durable water repellent (DWR) finish that causes water to bead and roll off. It breathes to prevent moisture and mildew buildup underneath, which is especially important for aluminum boats stored in humid environments.
Yes. The cover fits all Sea Ark 18 center console models with standard production dimensions, including the Shadow 18 and related variants.
The 9oz solution-dyed fabric comes in Navy, Black, and Charcoal. The premium Sunbrella acrylic offers an expanded color selection including Pacific Blue, Forest Green, Burgundy, and more.
Shipping is a flat rate per cover for delivery anywhere in the continental United States. Most orders ship within 1–2 business days.
Sea Ark 18 Center Console Boat Cover — All-Welded Aluminum Workhorse Protection
The Sea Ark 18 is an 18’0″ all-welded aluminum center console built in Monticello, Arkansas by one of America’s premier aluminum boat manufacturers. At approximately 750 lbs with a 6’10” beam, the 18 runs a single outboard up to 90 HP on a .100-gauge 5052 marine-grade aluminum hull with a .125-gauge treadplate floor and 3/16″ extruded center keel. Sea Ark has been building all-welded aluminum boats in Arkansas for decades, earning a reputation for no-wood construction and hulls that can take punishment that would crack fiberglass. The Shadow 18’s 3-degree modified-V hull provides a stable, shallow-draft platform ideal for rivers, lakes, and protected coastal waters. A custom-fitted center console cover from the Sea Ark collection protects the 18’s console, electronics, and deck hardware from UV, rain, and seasonal weather.
Tailored to the Sea Ark 18’s Utility Layout
This cover creates a single tent-like canopy that peaks at the center console — the highest point — then slopes smoothly down over the bow, gunwales, and transom, fully enclosing the outboard engine underneath. The fabric extends approximately 80% down the hull sides, covering the console, rod holders, livewell, and all deck hardware in one continuous drape. Installation takes under five minutes: drape, adjust, strap, and buckle. One person can handle it solo. The lightweight aluminum hull and galvanized trailer make launch-and-load simple, and the cover is reinforced for highway trailering. For the compact utility model in the Sea Ark lineup, see our Sea Ark 1652 center console cover.
Protection That Matches Sea Ark Toughness
Sea Ark builds boats from welded aluminum that laughs at stumps, oyster bars, and rocky river bottoms — and your cover needs to be equally durable. The 9oz solution-dyed marine fabric provides 5–7 years of UV and weather resistance with a water-repellent, mildew-resistant finish. Upgrade to premium Sunbrella acrylic for 8–10 years of protection. Both options feature double-stitched seams and breathable construction that prevents moisture buildup beneath the cover. Every cover ships with a 2-year manufacturer warranty. For a similar utility fishing platform, explore our Carolina Skiff 198 DLV center console cover.
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