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Seafoam King Starboard Plastic Sheets

As low as $21.75
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Note: The calculator automatically adds a $3 cut charge to any custom sized piece less than 2 sq/ft.
We offer Seafoam King Starboard in both established sizes, or cut to your unique requirements. The established sizes offer the most competitive sq/ft price (due to optimized yields), while the cut to size option provides you the opportunity to expedite your project by purchasing material already cut to your exact needs!

King Starboard is the leading marine grade plastic sheet -- used as the base construction material for thousands of boat component parts. It is easily fabricated with standard woodworking tools and environmentally and UV stabilized to last in the harsh marine environment. Seafoam King Starboard is an off-white color very popular in the marine industry.

Key Features:

  • Off-White Eggshell Color
  • CNC cut for a clean uniform edge appearance – no blade marks
  • Easy to fabricate using standard woodworking tools
  • Will not rot, swell, splinter or delaminate when exposed to humidity or water
  • Durable matte-textured surface
  • Easy to clean and never needs refinishing
  • Radius corners available - call for options
Works Like Wood, Lasts a Lifetime!

King Starboard is the original and leading marine grade boat plastic polymer sheet building material. Since its introduction, it has been the choice boat building material for marine parts previously made from teak wood. Nothing on the water maintains it's original color and structural integrity longer.

King Starboard simply cannot rot or delaminate, and it is virtually maintenance free. It's unique polymer formula is environmentally stabilized to deliver a previously unattainable level of consistency and resistance to the elements. It is easy to clean and never needs refinishing. King Starboard plastic lumber is available in a variety of colors and sheet thicknesses and can be easily cut and machined using standard wood working tools.

King Starboard is used exclusively by Teak Isle Mfg., the leading OEM supplier for component plastic marine products. Experienced boat builders and boaters know the King Starboard brand and trust it above all others.

For the marine industry: Access Doors, Center Console Doors, Transom Doors, Hatches, Tackle Storage Units, Drawer Units, Step Pads, Swim Platforms, Rod Holders, Tray Tables, Step Boxes, Anchor Chocks, Bow Pulpits, Fender Mounts, Deck Boxes, Step Boards (Gunwales), Sink Covers, Shower Grates, Dive Platforms, Cutting boards, Cabin Molding, Step Treads (Ladders), Electronics Mounting, Mounting Platforms, Fender Mounts, Upholstery Backs

Other Applications: Exterior Cabinetry, Summer Kitchens, Playground Equipment, Swings, Benches, Ottomans, Adirondacks, Shelving, Storage, Bars & Cabanas, Bathroom Partitions, Medical Carts, Shower Seats, Motor Mounts and Spacers, Lockers, Locker Room Benches, Engraved Signs, Pool Pump Bases.

King Starboard has three limitations to consider-
  1. It cannot be glued
  2. It cannot be painted
  3. It has less structural rigidity than wood
While there is some debate regarding gluing Starboard, we have never found an adhesive that we've tested and trust to structurally adhere Starboard. We would advise caution and skepticism if anyone tells you differently and we always recommend using mechanical fasteners with Starboard.

Paint (including polyurethanes) simply will not adhere to Starboard and upon drying will easily peel away.

Structural Rigidity
While Starboard is incredibly durable (and nearly impossible to actually break), it does not have the same structural rigidity as wood. For example - If you lean a piece of Starboard against the wall in your hot garage, you will return the next day and it very likely would have started to flex a bit.

The degree of this "flex" will vary by material thickness, but depending on your application, parts fabricated from King Starboard may require some metal stiffeners. If you have questions about your intended use, we'd encourage you to give us a call at 866-633-7961 to discuss if stiffeners would be required.
4.9 / 5.0
19 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Starboard light cover plates
Boat Outfitters made these perfect matching plates in no time and shipped them very fast. The finish is great and I'm very happy. This is not the first purchase from Boat Outfitters and won't be the last. Next is a custom hatch after the cover comes off of the boat in a few weeks.
Matching custom starboard plates. LED light conversion from stock stainless lights.
Matching custom starboard plates. LED light conversion from stock stainless lights.
April 1, 2019
1 month ago
King Starboard
Great product, great price, speedy delivery.
February 1, 2019
3 months ago
Quick Service, fair price but warped product
Order was for a 1" x 6" x 24" Seafoam with routing on one side. The product arrived to me with a serious bow in it length wise. That created some problems for me and reduced the quality of my final product.
December 26, 2018
4 months ago
I love it
It is perfect! the color and the routing. Stay tuned for the pictures
December 24, 2018
4 months ago
Great product great service.
Great price, great product, great shipping. Good job. I’m sure I’ll be back here when I need something.
November 30, 2018
5 months ago
Starboard items
I had several pieces of KIng Starboard custom cut. Items came cut exactly as I ordered and in only a couple of day. Great service.
October 22, 2018
6 months ago
Great stuff
I have worked with this stuff before and it is easy. Wood working tools are all you need.
October 12, 2018
7 months ago
Perfect cut and perfect fit! Got great advice when calling in. Quick shipping. Easy transaction.
September 18, 2018
7 months ago
King Starboard
Being able to buy 1" thick in the size and color I wanted without taking large sheets was most convenient. The product, as always, worked well.
August 16, 2018
8 months ago
Whaler wood replacement
I cut and routed a 1” thick piece of starboard to replace the mahogany deck cleat that holds the console on my 1984 Montauk. As easy to work as wood, worked perfectly! The cooler chocks are next.
August 15, 2018
8 months ago
Questions / Answers
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Browse 19 questions Browse 19 questions and 22 answers
I would like to order this in black but I do not see an option to choose the color during the product selection or checkout
Michael Florant on Jul 26, 2017
BEST ANSWER: Hey Michael,

The color is actually selected first, then you select size or thickness on that product page.

Here is a link directly to Black King Starboard -

Let us know if we can help with anything else Michael!
can I use this to mount a bow mount trolling motor on my center console ?
A shopper on Apr 9, 2018
BEST ANSWER: Great question! If you would be using this as a mounting plate, it would work well. You will want to ensure you select the proper thickness.
We bought an old pontoon for a boat dock. Once we removed floor there are t’s where plywood slid between to hold in place. Would I be able to use this as replacement sheeting on the pontoon. How would I fatsten to my aluminum braces?
Jill W on Aug 20, 2018
BEST ANSWER: Hey Jill, I would recommend using Coosa Board for your project, however the only sheet size available is 4' x 8'. You can find the material in the link below. The benefit to this material is it can be fiber glassed and/or bonded together to get the 5' you are looking for out of one panel. Thank you!
Can I use this for replacing rotten plywood seat bottoms? Can you staple vinyl material to it?
Mickey S on Aug 6, 2018
BEST ANSWER: Hi Mickey, this material can certainly be used for seat bottoms! However, to staple into the material (for your upholstery) you will need a pneumatic staple gun to fully seat the staples. Thank you!
will this be good replacement for decking my pontoon ?
mickey h on Aug 4, 2018
BEST ANSWER: Hi Mickey, Starboard is not the best option for full decking replacements. It works well for hatches, but is quite heavy and not as rigid as other options. I would suggest using Coosa Board if you are looking for a no-rot option to plywood. You can find this in the link below:
Thank you!
Can I use this to replace my rotted floor of my boat?
Dean F on Jul 9, 2018
BEST ANSWER: Great Question Dean,

You can use starboard as decking material, But you will need to be able to support the starboard every 18" to 20". If you are looking for a direct replacement for wood we have a product called Coosa Board. Here is the link This product can also work as an alternative to your floor.

Thanks Dean!
Also, best fasteners for attaching the cushioned side-edge combing, plugging it into the inside of the fiberglass gunnel?
Vandy on Jun 16, 2018
BEST ANSWER: Hello Peter, I am a little unsure of the materials you are looking to use for you project. For something like this it may be better to give us a call to discuss project with one of sales reps to make sure you get the correct parts to make installation as easy as possible.
Can I saw 1" thick material into 1/2" strips to use as base trim where my FB meets the deck?
SKIPPER P on Jun 13, 2018
BEST ANSWER: Hey Skipper, it sounds like this material should work well for your application. Thank you!
What options are there for custom cutting?
Jon H on May 1, 2018
BEST ANSWER: Hello Jon, we should be able to cut just about anything you would like out of Starboard or acrylic. If you would like to give us a call one of our project managers can go the details of your project and see what options we can come up with for you.
I purchased pontoon boat and the previous owner I believe used this product to make a transom. It seems warped and looks like spiderweb stress cracks. I don't feel this was a good choice of material ?
Jerry C on Apr 4, 2018
BEST ANSWER: Great Statement jerry,

We do not advise anyone to use this product as a structural component of their vessel. For a transom, We advise you to use our Cossa board product. This is designed to be used for structural components. I have included a link here: .

Can Starboard, when used as decking stand up to having a leaning post mounted to it?
Lotion59 on Mar 29, 2018
BEST ANSWER: Great Question Jeff,

Starboard is not structural engineered to take those kinds of load forces. We do not recommend using starboard as a full deck piece. This is due to the fact that this product flexes when in large sheets.

Thanks Jeff.
Don R on Mar 11, 2018
BEST ANSWER: Great Question Don,

You can use starboard for this application. If you have any other question please contact us at (866)633-7961.

Thanks Don!
We are reupholstering boat seat backs which use a L bracket attached to the boat sides. Would 1/4” seafoam King Starboard be appropriate? And 1/2” for seat bottoms 36”x17” and 21”x17”?
rockmommamel r on Feb 22, 2018
BEST ANSWER: Great Question!We advise that you use 3/4" for material that someone is sitting on. For the seat backs 1/2" would be more supportive and not flex as much. We typically recommend some type of support every 18-20 inches or so under Starboard products that will have a persons weight on them. If you are concerned about the weight of the product then Starlite is a better option. Thanks for the great question.
What thickness do you recommend for replacing new helm panel for electronics?
A shopper on Feb 13, 2018
BEST ANSWER: This is dependent upon what is being mounted to the panel. We recommend 1/2" thick starboard for any time a GPS (or larger/ heavier display) is being mounted. If you are only mounting switches or gauges, you can typically use 1/4" thick material. Thank you!
Interested in using 1/4” starboard sheets to fabricate a hardtop in place of the old vinyl soft top on a 2004 Jupiter 31 center console. Will this be suitable?
A shopper on Feb 2, 2018
BEST ANSWER: Starboard can be used for a t-top surface, although we do not recommend it. The issue you run into is seaming the cut pieces of material, as well as accommodating the curve to the structure. The material can be welded to close the seam that would be created in doing this, but we do not do any welding here. You can find the plastic welders we offer in the link below:

For more detailed information, please reach out to us directly at 866-633-7961.

Thank you!
Can your 1/2" stock be heated and bent to form shapes in the cockpit?
Rick B on Dec 10, 2017
BEST ANSWER: Great question - starboard can be bent with heat, but it will want to spring back to it's original shape. It entirely depends on what shape you are forming and how you plan to fasten it down. I hope this helps!
I need to install a floor in an 18ft jon boat. I was going to use plywood but came across this product. Any recommendations on thickness for a floor? I want to reduce weight but have strength. And is there a better option than this product? Thanks
A shopper on Dec 8, 2017
BEST ANSWER: Hello, if weight is a concern I would not recommend using Starboard for the flooring. We offer a material called Coosa which is a direct replacement for plywood but will not absorb water and is also 30% lighter than the equivalent thickness of wood. I will include a link to that material for you below.

If you have any questions about Coosa please feel free to give us a call and one of our sales associates would be happy to assist you.
I was thinking about using this material for a bench in a 1978 13' Whaler. How does handle warping?
Glenn C on Nov 17, 2017
BEST ANSWER: Hello Glenn, we actually build a Starboard interior kit for the 13 Whaler. If you would like to check it out I will include a link to that for you below. For the bench it would need some type of support in the middle to limit flexing. We typically recommend some type of support every 18-20 inches or so under Starboard products that will have a persons weight on them.

I hope this helps and please let us know if there is anything else we can do for you.
What thickness would I need for pontoon decking on 24" centers?
Angelic P on Nov 9, 2017
BEST ANSWER: Hello Angelic,

I would be happy to work with you on this, is there any type of cross bracing and what is the spacing on that? Is this a 24" square grid or just beams? Typically we do not recommend Starboard for decking due to the weight of the material but some people have used it depending on the overall size of the boat and number of sheets required.

I hope this helps and I look forward to your response.

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