You have no items in your shopping cart.

21'x41' Oval 84" Seaside Expandable Overlap 20 mil

Availability: In stock

FREE SHIPPING - 21'x41' Oval Expandable Overlap vinyl pool liner. This factory replacement 20 mil liner for Doughboy, Lomart and Embassy pools will fit most any 48"-54" above ground pool that require an expandable pool liner for deeper swimming areas. Use this pool liner for deep ends or deep center pools. Great for water depths up to 7' deep. Made in the USA from 100% virgin vinyl. Best expandable liner on the market.



Genuine factory replacement liner for Doughboy, Lomart and Embassy pools. This 18'x36' Oval Seaside Expandable pool liner is swirl water print on the entire pool wall and floor and can conform to nearly any shape pool bottom with up to 7 feet of water depth. If you know the Doughboy name then you know this is the best pool liner in the industry. A full 20 mil thick and built to last for decades. Will work with other brand above ground pools of the same size that require an expandable overlap liner.

Pool Liner Installation Tips - Below we have included 3 simple steps to a successful pool liner replacement. Following these simple procedures will make changing your pool liner easier, prevent corrosion, stop leaks and add years of enjoyment to your swimming pool investment. If you have any questions about installing your new liner or have questions about the products listed, please see Documents or Related Products. And as always, you can call our tech support line for live human customer assistance.

1.) Examine The Pool Wall - Take a close look at the entire pool wall top to bottom. Now is the time to fix any underlying issues that may be lurking. Scrap off flaky rust, scale or anything that could potentially puncture your new liner. Once the pool wall is cleaned up, a quick coat of similar colored spray paint over any bare metal spots will ensure further corrosion is halted. If your pool wall has a rough textured surface due to rust or corrosion, follow up with Pool Wall Foam and Wall Foam Adhesive. These products will smooth out the wall texture and prevent any damage to your new liner investment. It is also good practice to re-tape over the bolt heads on the pool wall seam. Remove any old material and put down a new layer or two of duct tape over the heads. This should remove any sharp corners smooth things out nicely.

2.) Address The Pool Floor - Once attention to the pool wall has been completed, improvements to the pool floor can be made. Take the time to make the pool floor smooth and level by picking out rocks, roots and other obstructions before filling in ruts and low spots. Be sure you have an adequate pool cove of at least 4" up and 4" out from the pool wall. This cove should run continuously around the entire pool floor perimeter. Apply nutgrass killer to the ground if needed and put down Armor Shield pool floor pad if you have one. Armor Shield is an incredibly strong one piece pre-cut pool floor pad that protects your pool liner from damage caused by sharp objects, insects and rodents. We highly recommend Armor Shield as a base for all flat bottom above ground pools and it's a must for those built directly on concrete. Armor Shield and other types of pool floor protection are typically not recommended for deep middle or deep end pools as the material has a difficult time conforming to the complex shape of the pool bottom without bunching up or causing wrinkles. If you use more than one Armor Shield and modify them, or are willing to cut reliefs in the material so it can lay flat, it is possible to obtain excellent results.

3.) Replace Old Plastic - Leaky skimmers and return jets are the most common cause of premature pool wall failure or rust out. This is often caused by bad gaskets, cracked face-plates or stripped out skimmer screws. Plastic pieces like coping strips, skimmer boxes and face-plates become dry and brittle from years of exposure to the sun. Once removed from the pool, they often cannot be re-used. We recommend always changing these plastic parts if possible as they are inexpensive and great piece of mind. But if on a budget, they may be re-used if in good shape. Examine them closely and replace the skimmer box or skimmer face-plate if any screw holes are stripped out or if there is excessive cracking around the screw holes of the skimmer or skimmer face-plate. Check that the pool skimmer and return jet gaskets are in good condition, still soft and pliable. And always replace old or cracked liner coping strips or bead track sections to ensure the pool liner is held firmly on the wall. Remember to examine the plastic parts before ordering. Don't get stopped halfway through your liner change because you need these items.

Additional Info

Additional Information

  • Country of Manufacture
    United States
  • Pool Size
    21' x 41' Oval
  • Liner Type
    Expandable Overlap
  • Pool Wall Height
    52" Wall Height
  • Liner Thickness
  • Brand
  • Warranty
    25 Year

You're reviewing: 21'x41' Oval 84" Seaside Expandable Overlap 20 mil


Call us today: 1-866-534-9725

Call us: 1-866-534-9725