Materials guide
Marine vinyl or fabric: what survives Gulf Coast sun and salt
The Mississippi Sound is one of the hardest places in the country to keep a boat looking good. Here is how Gulfport Boat Upholstery picks between vinyl and fabric for each piece, and what each choice does to the price.
Call (228) 206-7732Why the coast eats upholstery
Three things work on a boat in a Biloxi or Gulfport slip at the same time. The sun sits high from April through October and the ultraviolet index runs at the top of the scale most afternoons. Salt spray dries on every surface and pulls moisture back out of the air at night. And the humidity never really drops, so anything that holds water stays wet long enough for mildew to take hold. A material that does fine on a lake boat in Tennessee can be chalked, cracked and black at the seams after two seasons on the Sound.
That is why the question is never vinyl or fabric for the whole boat. It is vinyl or fabric for this piece, given where it sits, whether people sit on it and whether it ever gets a chance to dry.
Where marine vinyl wins
Anything you sit on or that takes spray gets vinyl. Helm chairs, bench seats, bow cushions, leaning post pads, cooler cushions, sun pads, coaming bolsters and pontoon furniture. Vinyl does not absorb water, so a seat that gets soaked at the pass is dry by the time you tie up. It wipes clean of sunscreen, fish blood and the red clay that comes off every trailer in Harrison County. And with closed-cell foam underneath it, the whole cushion drains instead of turning into a sponge.
The catch is that vinyl is not one thing. Automotive vinyl looks the same on the roll and costs less, but it has no ultraviolet package and no mildew inhibitor. On the same boat it cracks in about two summers. Marine grade vinyl is built with ultraviolet stabilizers, an antimicrobial topcoat and a cold crack rating, and it goes seven to ten years uncovered in a slip. The premium grades add a thicker topcoat and a heavier backing cloth. On a boat that lives uncovered at Point Cadet or Gulfport Small Craft Harbor, the premium grade pays for itself by year five.
Vinyl grade is one of the three things that move a seat price inside its published range. A single seat or bench re-cover runs $200 to $550. Sound foam and a standard marine vinyl land near the bottom. Waterlogged foam and a premium vinyl with pleats and piping land near the top.
Where fabric wins
Anything that stands in the sun and needs to breathe gets fabric. Bimini tops, T-top canvas, mooring covers, storage covers, console covers and the cloth parts of an enclosure. A vinyl bimini would trap heat, sweat underneath and crack along the bows where it flexes in the wind. A woven acrylic sheds rain, lets air move and folds a thousand times without breaking down.
Here the grade question is Sunbrella or polyester. Sunbrella is a solution dyed acrylic, which means the color goes all the way through the fiber instead of sitting on the surface. It holds color for eight or more Gulf summers and the fabric itself is often still sound at year eight. Marine polyester is coated, lighter and about a third cheaper, and on this coast it fades and gets brittle well before the acrylic does. For a cover that comes off the boat between trips and lives in a locker, polyester is a fair buy. For a bimini that stays up from March to November, Sunbrella every time.
The published bimini range is $600 to $1,500 on your frame, and the fabric choice is the biggest thing that moves it. A full mooring or storage cover is $900 to $2,500, and there the length and the fabric weight do most of the work.
Expected life on the Mississippi Sound
| Material | Best use | Uncovered in a slip |
|---|---|---|
| Automotive vinyl | Nothing on a boat | About 2 summers |
| Marine vinyl | Seats, cushions, bolsters | 7 to 10 years |
| Marine polyester | Covers that come off | Fades before the acrylic does |
| Sunbrella acrylic | Biminis, T-tops, covers | 8 or more summers |
A mooring cover or a covered slip stretches every number in the last column.
The two things under the material that matter more
Most upholstery on the coast does not fail at the face. It fails at the seam or in the foam. Polyester thread rots in ultraviolet light years before good fabric or vinyl does, which is why so many biminis in Ocean Springs are hanging open at the seams with fabric that still has full color. We sew everything with PTFE thread, which is unaffected by sun and salt and outlasts the cloth.
Foam is the other one. Open-cell foam soaks up water like a sponge, and a seat that never dries will smell, sag and rot the vinyl from the inside. Closed-cell foam drains and floats, and it belongs on every fishing boat, every cockpit cushion and anything that takes spray. We squeeze test every cushion at the dock before quoting. Foam replacement adds $50 to $150 per cushion, and a seat with sound foam keeps that line off the quote entirely.
Keeping either one alive longer
Rinse with fresh water after every salt trip, especially the seams and the snap line. Skip bleach on vinyl. It strips the topcoat and shortens the life of the piece by years. A mild soap and a soft brush handle everything short of mildew, and a marine vinyl cleaner handles the mildew. Put a protectant with ultraviolet blockers on vinyl a few times a season. Store loose cushions inside or under a cover when the boat sits for more than a week. A covered slip or a mooring cover is worth more than any product you can buy, and it is the single biggest reason two identical boats at the same harbor can be four years apart in how their seats look.
If you want us to look at a specific piece and tell you which way to go, send photos through the form or book a dock visit. The full price table shows every range on this page in one place.
Material questions
- Can I put fabric on boat seats instead of vinyl?
- On a wet slip boat, no. Fabric seats hold water, grow mildew inside a season and stain from sunscreen. Vinyl over closed-cell foam is the only combination that dries out between weekends on the Sound.
- Is automotive vinyl cheaper and good enough?
- It is cheaper and it is not good enough. Automotive vinyl has no ultraviolet package and cracks in about two summers here. Marine vinyl on the same seat is seven to ten years uncovered.
- Does Sunbrella come in enough colors to match my boat?
- Yes. The marine line runs well over a hundred solids and tweeds, and the common boat colors (navy, captain navy, toast, linen, black, forest) are stocked. We bring the swatch book to the slip.
- What about the thread?
- Thread matters as much as the face material. We sew vinyl and canvas with PTFE thread, which does not rot in ultraviolet light. Polyester thread is why so much canvas on the coast fails at the seams while the fabric still looks fine.