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Seafoam King Starboard Plastic Sheets

As low as $21.75
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Note: The calculator automatically adds a $5 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
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
31 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
It was a perfect fit.
That starboard piece made my center console look so much better as i am updatind my electronics, thanks a lot.
October 10, 2019
1 month ago
Cut to size King Starboard
The color was perfect, the pieces were cut exactly to my measurements, and the edges were rounded and finished.
It made replacing my old electronics very easy, I was more
than happy with this purchase, the turn around time from ordering to delivery was much faster than I expected. Much
better than buying a whole sheet and trying to cut it myself!
September 20, 2019
2 months ago
Nice to have custom cut
Worked perfectly for application right color. Quick shipping.
September 6, 2019
2 months ago
Great product!
Perfect replacement for an older boat. Very pleased.
New top
Nrw top, Upholstry, and locking latch.  All from Boat Outfitters!
August 28, 2019
2 months ago
Awesome product will definitely use again
I can’t wait for my next job that I have to use king seaboard on. Great material and they custom cut it to my specifications perfectly.
Perfect fit and color matches the console color.
User submitted image
User submitted image
Very easy to cut and work with I had no problems installing the garmin.
Ordered a custom cut piece and it fit perfectly. It was easy to countersink the screws and mount.
June 26, 2019
4 months ago
StarBoard match for Scout
I wish we could glue like Corian but otherwise great... Scratches really easily too. Seafoam matches my 2000 Scout perfectly!
Closed up the wide outboard opening 24". The Pacific doesn't get backwash over the transom!
Closed up the wide outboard opening 24". The Pacific doesn't get backwash over the transom!
June 19, 2019
4 months ago
Backrest for my 110 sport whaler
I purchased the 1inch King StarBoard to support a seat cushion it’s a small whaler and it’s not an upgrade that could be purchased.
I did not want it to look like a quick fix, I am delighted with the end result.
A guy in Florida made the seat back cushion and the StarBoad backrest worked perfectly
I used the Seafoam StarBoard as a backing for my Boston Whaler backrest added 2 ubolts for fixing
June 12, 2019
5 months ago
I built an outdoor fish cleaning station out of it and it looks beautiful. I cut a hole for a sprayer and did the base and backsplash out of fieldstone. It looks beautiful! Only a long period of time will tell how well it will hold up, but right now it is perfect.
May 30, 2019
5 months ago
Custom Starboard Console Renovation
Great product at a great price! Sent in a template I made of my console dash, and Majid with Boat Outfitters sent me back a nice 1/4" piece of starboard to cover the old holes in my console. Finished it off with Sea Dek and a keeper strip! It looked professional and factory cut! Only way to go!
User submitted image
Added May 17, 2019
May 17, 2019
Best resource for King Starboard!
Beat price and fast delivery!
April 24, 2019
6 months ago
Questions / Answers
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Browse 20 questions Browse 20 questions and 26 answers
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!
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.
I want to use the product as an awning over our front porch. I live in Portland OR so snow loads are light - 20 psf. I would cut to 36 x 54 and it would be supported at two locations 42” span. I wonder if 3/4” thickness would work?
Brian S on Jun 19, 2019
BEST ANSWER: I imagine it would work as long as you have the proper support in place. I used for one of my projects the 3/4 as bridge steps for my boat and they don't flex when I stand on them. the step is 5 x 14
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!
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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