Marine Zippers Giving you Trouble?

Repair Solutions To Lesson Your Frustrations


  • Manufacturer of marine zippers and warranties
  • Zipper sizes
  • Zipper terminology
  • Repair issues and tips
  • Order Marine Zippers here!

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  • Ask a question? Need an answer? Do it here!

In the US there are three big zipper manufacturers that are used on boat cover applications

In order of popularity:

YKK- UV resistant zippers (most common) but has no warranty

Lenzip- UV resistant zippers are the only zippers available that offer a lifetime warranty. They also YKK compatible.

RiRi- UV resistant zippers with a five-year warranty. RiRi zipper is not YKK compatible. RiRi marine zippers are almost not available in the US and I suspect will be gone before long.

Marine zippers have been a source of frustration for boat owners for a long time. After time exposed to the sun's UV rays, they begin to breakdown. They get chalky and become brittle. They eventually lose their teeth, or the teeth begin pulling apart. Another big complaint is the zipper slider.

Are there different sizes? Yes, there are, and it's important to know which size you have and which size you need to request if you are having custom boat covers built for you.

The most common sizes of marine zippers used in the industry are #5, #8, and #10.

In my shop we use YKK #10, and Lenzip #10. 

I keep #8 YKK Marine zippers for replacements on factory manufactured boat canvas. This is because many boat canvas manufacturers use them. If I had a choice, I would never use a #8 marine zipper.  My thinking is why go smaller when bigger is available. 

How do you know if you have #8 or a #10 zipper?

Follow the method above to figure out what size zipper you have

IMPORTANT: Please measure accurately before ordering!
Please don't guess, #8 and #10 look very similar.

  • Lay out your zipper on a long, straight, flat area, and ensure there are no puckers or curves.
  • Measure how many teeth you have per inch.
  • #8 boat zippers have six teeth per inch.
    #10 boat zippers have five teeth per inch.
  • Unsure? Use 2" instead of 1" for counting teeth. Example: A #8 zipper would have 12 teeth per 2 inches and a #10 would have 10 teeth per 2 inches. 
    Notice, every time you add an inch to your measurement the tooth count between the two sizes of zipper becomes more noticeable.
  • Still Unsure?  If your not in a big hurry, request a sample to compare your zipper teeth too. Use the contact us page to do this.  

Counting your teeth per inch will give you the right information when ordering.

Here is a picture of a separating marine zipper and the proper terminology starting with #2.

Separating means that the zipper unzips and the two sides completely separate from one another.

2. The #10 Separating Marine zipper
3. Insert pin
4. Retaining box
5. Box pin
6. Teeth Elements
7. Zipper tape
8. Zipper slider unit

Below is a list of the things that are most likely to fail on a marine zipper, and what to do about them

Tip: Determine your zipper size (see what size zipper do I have)shown above, and keep a dozen extra metal zipper slider and stainless steel crimp-on zipper stops on your boat for repairs. In salt water boaters, replace the pulls once a year. Stainless steel zipper pulls are on the market for salt water boaters along, and they are worth the price since you can keep them for life and can put them on all future boat zippers you may have. Another nice add-on marine zipper option is a lanyard zipper pull. This cord attachment adds additional length and gives more to grab and pull the zipper up and down with.

If the retaining box breaks off.

  • Sorry there is no quick fix, replace the zipper.
  • Teeth on each half of the zipper separate and will no longer hold together. Check your zipper teeth for extreme degradation.

  • If you have plastic zipper sliders, try replacing them with metal zipper sliders. Vislon plastic zipper sliders weaken, and once that begins, they won't push the teeth together.
  • Preventative maintenance helps protect your teeth. Iosso makes a product called E-Z Snap Lubricant, and it is designed for use on snaps and zippers. Keep in mind, if there is substantial degradation on your zipper teeth, it does make the degraded teeth slippery. This can facilitate the failure of the locking bond between the two sides of the zipper teeth. This is especially so, in a load bearing situation, such as zippers for bimini tops. So if you use E-Z Snap Lubricant, it is best to use it from the beginning to slow down the deterioration and not after substantial deterioration has begun. Try wax based products for older zippers, such as; Bees Knees.  Bees Knees is great for new zippers too. 
  • Run your thumb across the zipper teeth – are the teeth falling off after applying a pressure touch? Is your thumb covered with what looks like white or black chalk? A little chalkiness is normal, a lot is a sign that the zippers are kaput and need to be replaced.
  • Stuck zipper slider

  • If you have a stuck zipper slider unit because of salt corrosion or age, try WD-40 and a hair dryer. Next, since by now you have several zipper pull replacements already on your boat, you can try prying open the zipper pull very carefully so not to break the teeth using a wide flat head screw driver and tapping it between the edge of the pull from the side and forcing the pull open enough to free the teeth. This takes time and patience and you can still break the teeth, but sometimes it works. If that doesn't free it, or you break a tooth anyway while removing the pull, then you might try using EZ-Xtend Boat Zippers for a quick repair or replace the zipper.
  • Marine zipper strain caused by material shrinkage

  • As your boat canvas ages, it begins to shrink. The more strain on your zippers, the more likely the teeth will pop open. This is the perfect time to try EZ-Xtend Boat Zippers as a spacer zipper to relieve the pressure. If possible, use EZ-Xtend Boat Zippers to relieve the pressure before zipper failure. They can be used vertically and horizontally as spacers between existing zippers. Installing EZ-Xtend boat zippers will help extend the life of your boat canvas and boat enclosures.
  • Zipper stop fails and slider falls off the bottom of the zipper.

  • Canvas shops use all kinds of ways to stop the slider from coming off the bottom a zipper, and some of them are not so great. Since you may have reason to replace a zipper pull anyway, you will want a supply of stainless steel crimp-on zipper stops on board. The #10 zipper stops will work on #8 zippers as well. Keep a few handy for repairs.

  • Order Your Separating Vislon Marine Zippers Here!

    Please Read Before ordering zippers

    The marine zippers we sell are the same zippers we use in our shop, and are shown on this page. They are made for an outdoor environment. 

    • The zipper slider that comes with our zippers is metal and has double locking pulls, that just means they won't open by themselves.
    • We aren't big fans of plastic sliders, but we understand that not every boater feels this way.  If you would prefer a plastic slider, we are happy to send you one with your zipper order to swap out the metal slider that comes with it. The bonus is you have an extra metal slider on hand.  You will find a text box below when placing your order to indicate your preference. 
    • #8 Zippers are only available with metal sliders.
    • A stainless steel zipper stop is sent with the purchase of every zipper.
    • Don't forget - Know what size zippers you have before ordering, you can find that information by scrolling up this page. If you are unsure, request a sample from our "contact us" page.
    • In our shop we carry common sizes of zipper that cover every boaters needs, so order the size longer than the actual length you need. They are easy to cut down. 
    • #8 zippers not available in 240" lengths.

    Click here to buy separating marine zippers in the store!

    Order your zipper sliders here!

    Please Read Before ordering sliders

    • Zippers sliders should be kept handy on boats, because the metal corrodes and the plastic sliders weaken with age break or get lost. In a salt water environment the metal sliders should be swapped out yearly. 
    • The #10 sliders are available in stainless steel, metal or plastic with locking double pulls. 
    • Sliders for #8 zippers are not available in plastic.
    • All metal and plastic sliders are sold in multiples of five.
    • Stainless Steel sliders are available in pairs.
    • If you have a slider with 10c stamped on it, you need coil sliders.
    • 240" only available in #10 size.
    • Order stainless steel crimp on zipper stops separately. 

    Click here to buy zipper sliders in the store!

    Order your zipper tabs here!

    Available colors

    • Black neobraid w/black tab
    • White neobraid w/black tab
    • Charcoal neobraid/w black tab

    View in Store

    Buy your stainless steel crimp on zipper stops here!

    • Stainless steel zipper stops were designed for #10 zippers, but will work for #8 zippers too.
    • They crimp on the last tooth of the slider side of the zipper as seen in the photo earlier on this page.
    • Zipper stops are sold in multiples of ten - $2.00

    Click here to view zipper stops in the store!

    Do You Have a Question You Would Like to Ask About EZ-Xtend Boat Zippers or Marine Zippers?

    We'd like to help you find a solution! You just might be able to help someone else trying to solve the same problem. Please include your email address, we may choose to contact you directly with an answer to your question.

    What Questions Have Other Visitors Asked?

    Click below to see contributions from other visitors to this page...

    what size is good for isinglass radius corners, #10 pucker to much ...please advise 
    radius corners pucker when using the larger #10 or #8 zippers. Im considering using number #5's for the isinglass windows

    grady white zipper replacement 
    I have grady white 282 sailfish. I have #8 replacement zippers which appear to be exact size as broken one. However, removed the zipper stop and took off …

    Hi, I have some older Sunbrella window covers on my boat and they have this horrible white plastic binding that is all cracked. I used a seam picker …

    In the salt water environment, do you recommend Plastic or Metal Self locking YKK #10 Pulls? Tricky question. Metal is stronger and I prefer them, …

    I have a Sun Tracker bimini boot and the damaged zipper is 48" long. Can I cut a 60" size #8 zipper down to 48" or do you sell 48" zippers ? 
    I have a Sun Tracker bimini boot and the damaged zipper is 48" long. Can I cut a 60" size #8 zipper down to 48" or do you sell 48" zippers ? Hi Ron, …

    How can I sew a zipper? 
    Do I need a special sewing machine and a special sewing thread? Hi Rudy, Let's first talk about the sewing machine. If you already have a sewing machine, …

    zipper is in perfect condition the retainer box came off can this be replaced 
    retainer box came off the zipper is in perfect shape except the retainer box can this be replaced. How do this stay on in the first place. thanks Hi …

    Marine grade zipper 
    Hello, My name is Debora and I am making a sail cover and need to order a #10 seperating zipper but, I need the pull to be stainless steal and I need it …

    Zipper for my Stack Pack 
    I am looking for 195 inch very strong zipper for the stack Pack on my sailboat and that protects the main sail once doused. I have replaced it twice already …

    How to replace zippers on larger enclosure 
    I need to replace zippers and I ran into a problem. I tried replacing one side of the enclosure while keeping the zipper complete (both sides of zipper …

    how do you replace the slidder box on the zipper 
    I have a 1985 sea swirl topaz cuddy. The zipper slides corroded and broke off for the rear and port side panel. should I buy your ez xtend zipper . I …

    West Marine zipper seizing 
    I am in the process of returning or replacing a 5 year old marine jacket because the zippers have frozen up. I am a recreational sailor and have occasionally …

    Double Zipper - Which of your products would be appropriate to replace a double zipper on an Isinglass smiley face. Either #10 or #8 will work. Length around the smiley face is 103". Color = black.  
    Which of your products would be appropriate to replace a double zipper on an Isinglass smiley face. Either #10 or #8 will work. Length around the smiley …

    Purchase from a non-us esident travelling to US in end of may. 
    Hi, I do not live in US but ill be travelling for memorial day to FL, how can i buy a Marine zipper from you? could I use a non US credit card? thanks …

    what kind of machine is best for sewing marine zippers? 
    I need a heavy duty machine and don't know what to buy. Hi Roxane, Good question. I think that depends somewhat on your budget and your space for …

    zipper slider size requested 
    just bought yatch, zipper stops missing on 2 zippers, now i lost 1 slider, didn't know stops were missing. My question is what size zipper slider do I …

    can you replace a #8 plastic zipper on a sail cover with stainless zipper and pull? 
    We have a sail cover with a degrading plastic #8 zipper. I would like to replace it with a #10 stainless zipper as the boat spends a lot of time in salt …

    Are your zippers YKK or Lenzip? 
    I need to replace the full canvas and Biminis on my Sea Ray EC390 and would like to know if the zippers you sale are the YKK or the Lenzip ones? Did I …

    trying to build a sun shade. need to attach one part of zipper to the hard top the other end on to the sunbrella fabric. Not sure what you call the piece …

    there are two 48" zippers on the boat offer 36", then jumps to 60"..can you'all cut them to size?? 
    replacing zippers on a boat cover need four total, two - 94", two 48" see that I can order the 94", but how to get the 48" ones?? Hi Tracy, Marine …

    52" I NEED 2 AND A 26" I NEED 2 AND 42" I NEED 2. CAN YOU HELP. All zippers can be cut to size. You can order the closest sizes. It's very easy, …

    Bimini Zipper Problems 
    The zippers on my bimini top (2000 Regal Commodore 2460)are shot - corroded. The slides are jammed and now broken. I tried to free-up using white vinegar …

    Zipper Stop Removal 
    I want to replace my YKK #10 aluminum sliders with stainless steel sliders. Is there a tool or a trick that will remove the stop from the zipper without …

    Retainer box 
    I have a 2004 jeep wrangler and need a replacement retainer box for a #10 zipper. Any idea on where to purchase the retainer box? Justin, Retainer …

    Click here to write your own.

    Zipper for a Bimini top, black, 24 inches 
    I need a zipper that has two sliders that will separate to allow a cable through then close around the cable and not slip, # 10 marine grade. Thanks …

    What is best way to lubricate a plastic zipper?  
    To lubricate a plastic zipper on a boat canvas. Hi Richard, That answer we have found to be a little tricky. I think it really depends on how old …

    If the retaining box breaks can it be replaced? 
    The retaining box fell off the zipper and i was wondering if just the box could be replaced? Hi Don, No, the retaining box cannot be replaced and is …

    Where are you located in South Florida? 
    Zipper replacement help. Hi Kevin, I am in Buford GA. There is a nifty fabricator locator online that can be found here. …

    Can you supply zippers to an address in the United Kingdom? 
    Replacement zips on yacht awnings. Hi Steve, It shouldn't be a problem to send zippers to the UK. How many are you looking for? The easiest way would …

    do you supply open ended zippers in excess of 12 mtr 
    i am making a roller genoa sock for which i need the zip.size 8 shold do Possibly, most genoa socks have ropes coming out of the sock at some point …

    Do you have 36" white Riri #8 zippers ? 
    Building an enclosure for a boat using pieces build previously with Riri zippers. I thought this would be an easy request, but my normal supplier is …

    Hi, Need 2 very long, havy duty zippers, 28 feet long, 
    Hi, Need 2 very long, havy duty zippers, 28 feet long, with stainless slider, for my jib sail and cover for it. Could you help me with that? Please …

    Are these sliders compatable with riri? #10 marine 
    Replacement slider for riri. No, riri are different than any other slider. I do have a few of those in white. You can order the ykk sliders if you …

    do i need to buy stop for zipper io orderd? 
    just want to know if zipper stop comes with zipper HI Jeff, No, but I can send one at your request! Only one is needed per zipper.

    Lenzip zippers 
    Hello I have a marine canvass that has lenzip zippers. I have tried YKK 10 from local supplier and they did not pull the zipper tight. Based …

    problem ordering product 
    when i try to choose pay pal the web site says please enter country and valid zip code when i do this it will not accept 313 491 …

    looking for a one sided #10 marine zipper for a underwater utility bag 
    This is a bag, so one sided zipper is what is required. The existing zipper has lasted several years with occasional lubrication. Hi Jeff, I am not …

    Click here to write your own.

    YKK is a trademark of YKK
    Lenzip is a trademark of Lenzip Corp.
    RiRi is a trademark of RiRi
    EZ-Snap is a trademark of Isosso

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    Fantastic Results

    "I wanted to thank you for the fantastic results I have with the EZ-Xtend zipper solution you provided for my Sea Ray.

    The isinglass had shrunk to the point that installing it was an all-morning job, with some snaps totally unusable due to the material shrinkage. I really was preparing to purchase a complete new canvas set, but hated to spend the money-especially since the canvas is still in excellent shape.

    The EZ-Xtend zippers have made the canvas/isinglass installation and removal about a 10 minute job! (and looks great too!) Thanks again for the quick solution and the reasonable cost, I really do appreciate it.
    Steve Donovan

    The Bottom Line

    The extend zippers have been a resounding success. Zippers were needed for the starboard stern section of my bimini top, and for both side curtains of my camper canvas. It is a clever design you came up with to increase the width of connectivity between my bimini top and camper canvas sections. I do not know what I would have done otherwise as the camper canvas sections have shown shrinkage over time.
    M. Marien

    Such a Great Idea

    I got a chance to install these yesterday and just thought I'd get back to you to let you know that they worked perfectly for me. I couldn't be happier with that simple to install solution to my problem now allowing me to properly and fully enclose my cockpit again. Such a great idea.
    J. Reed
    British Columbia

    Easy to Install

    The Ez-xtend zippers were very easy to install---especially with a little lubricant ( which I always apply periodically to zippers)
    New Jersey

    Rare Traits

    "True skill and craftsmanship are rare traits in today's society. When they're held by a person that truly cares about her customers, brings honesty, creativity and passion to her work, you have just described Tammy Hampton. Better known as "The Cover Girl," Tammy has been both a friend, mentor and business partner for nearly twenty years.

    I found Tammy by her name tag.... sewn to a sailboat cover, in a nearby marina. The boat cover was fitted with such precision, it clearly stood out from the others. In the years since, Tammy has 'dressed out' at least twenty boats for me. She has yet to meet a challenge for which she could not find a creative and effective solution.

    Tammy has become a valuable resource to my Boatbutler business, and she has actually created sort of a "cult" following among my customers. Once they see the quality of her work, the choice is an easy one.

    I am still grateful for that little tag on that sailboat cover I found nearly twenty years ago."

    Steve Hammond
    Owner, Boatbutler Marine Services, Inc.
    Alpharetta, Georgia

    Brilliant and Simple Solution

    WOW!  I just got the EZ-Xtend Boat Zippers for my canvas and what a simple solution! Thank you for coming up with this.  I am telling my friends about this product.

    Susan M. 

    You Made Everything Easy

    We just installed the zipper we received on our sea ray boat canvas- what an incredibly easy experience!  It makes snapping the canvas so much easier with the zipper extension.  Thanks for the crimper & tape - you made everything easy.  We just ordered 5 more longer ones to completely update our canvas.  Thank you so much for your quick response on our first order. 


    Love Your Website

    I love your website and wish we lived closer, so that I
    could stop by your shop - sounds like a wonderful place!
    Judy D
    Winchester, TN