Fixing a Zipper Frozen by Salt Spray
A discussion started in 2004 but continuing through 20202004
Q. I am having great difficulty dissolving crystallized salt spray from the inside of the zippers of my boat bimini top. The zip-in side curtains have never been used and, therefore, have six years worth of weathering. The zipper itself is plastic and in fine condition, but the zipper "pull" is metal and "seized" from the salt air/spray.
Any suggestions would be greatly appreciated.
Personal/Boater - Jackson, New Jersey
Q. I have a frozen zipper as well, corroded by sea salt. How does one fix this?
- Manhattan Beach, California
A. Please try WD-40 [affiliate link to product info on Amazon] gentlemen. If it's aluminum and WD-40 doesn't make it functional, I think you have little hope. Actually, Richard, you are not seeing crystallized salt. Salt is instantly soluble in water.
Most likely it is aluminum corrosion products that look a lot like dried salt. Once the original lubricants are gone, if the aluminum starts corroding into voluminous corrosion products, the corroded parts are actually bigger than the raw parts so they don't fit anymore.
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha
February 18, 2008
A. For those of you who want to repair corroded delrin type and/or metal zippers, try dilute
[affiliate link to product info on Amazon]
(approx. 10 parts water to 1 part muriatic acid). Make sure to wear rubber
[affiliate link to product info on Amazon] and protective eye-ware (
[affiliate link to product info on Amazon]) and apply with a soft-bristle tooth brush ONLY to the zipper. Avoid any cloth material because the acid will degrade that material pretty quickly. You'll probably see some reaction on the heavily mineralized portions of the zipper, but keep applying until the zipper is freed up.
I live in one of the most corrosive environments in the world and all of zippers eventually fall prey to corrosion, but this technique does work. Two rules, be patient and protect your skin and eyes. Muriatic acid is potent stuff, so make sure to dilute it. As well, remember your Chemistry 101 basics and always pour the 1 part acid INTO the 10 parts of water. Good Luck.
- Saipan, Commonwealth of the Northern Mariana Islands
July 31, 2009
WD-40 [affiliate link to product info on Amazon]and heat gun or hair dryer. Worked great THANK YOU! ! !Ron Brown
- Redondo Beach, California
Marine Aluminum Restorer and Polish
Great results! I read all the above responses, and started experimenting on my husbands dive equipment bag that had every zipper solidly frozen.
I used water, a tooth brush, and all had was apple cider vinegar, but I have it a shot. I first used water to dissolve as much as possible right around the metal zipper pulls on the plastic zipper. I used a pin to take off chunks. I then poured the vinegar around the areas. I just hoped for the best while expecting little while waiting as one response had said--overnight.
My husband approached me when I least expected it, saying that all zippers now opened easily! No WD-40 needed, which he had not wanted due to the oily nature.
The water and vinegar solved the problem amazingly!!! I probably would have cut the bag to get the equipment and bought a new bag had it not been for this site!
- Laguna Beach, California
January 23, 2018
Q. I have aluminium zippers on my Caravan. The pull tab is aluminum and the zipper teeth are plastic and the pull tab has got aluminium oxide build up between the pull tab and the plastic teeth I have tried silicon spray WD-40 and still the zippers wont budge before when we got the van they jammed up and I managed to free them as there was not that much aluminium oxide build up on them so after freeing the sippers last time I rubbed candle wax all over the zipper and the worked fine but after leaving them for awhile they have corroded up again this time they will not budge as per everything I done in my description above we do not live by the sea we live inland boiling hot in summer and freezing cold in winter can anybody suggest something on how I can free up the zippers please.Brian Stocks
- Willow Tree N.S.W. Australia
February 7, 2018
A. I finally got my zippers freed up. I bought some calcium and lime scale remover powder and diluted it down 50 mil of water then just the tip of a teaspoon of powder then used a syringe and put a few drops between the zipper and the pull tab gave it a tap after leaving for 5 minuets it then came free. I then sprayed the area with water to dilute what was on the zipper and material. I then sprayed silicon spray on the zipper teeth and the zipper now moves freely.Brian Stocks [returning]
- Willow Tree N.S.W. Australia
November 30, 2018
A. Had salt water air corroded/stuck zipper on a kite bag. Read everything. Looked in my wife's pantry. Only rice vinegar,so tried that. Saturated all entry points of zipper-pull with zipper using syringe to apply drops. No luck. Then heated area with blow-dryer. With a little effort the 1st stuck zipper was free. Cleaned white powder on zipper with same vinegar using q-tip. Repeated application-soak x 10 min, heating to remaining stuck zipper and it too was free.Paul Stobie
- Kihei, Hawaii USA
December 13, 2018
A. If and when you get the zipper to move, use pure bees wax and apply it on both sides of the zipper after heating it up in a small sauce pan and run the zipper up and down several times so the bees wax gets in between the teeth of the zipper. If it is a metal zipper, I have use a product called Blaster [affiliate link to product info on Amazon] which is like WD-40 but works way better to loosen rust or electrolysis between metals.peter yzerman
Automotive Tech - Port Hueneme, California USA
October 20, 2019
I found this thread after trying to find a solution to a zip that was stuck fast from 7 years on a pontoon boat and despite a good spray of WD-40 which didn't make any difference decided to try vinegar. I soaked the zip in a container of white vinegar for several hours and was delighted when my husband said it had worked. Had to go and see for myself as didn't believe him...and lo n behold it was now working again.Lyn Bayens
- Mandurah, Western Australia
December 3, 2019
A. CLR [affiliate link to product info on Amazon], toothbrush , and Singer sewing machine oil worked on mine for a suitcase. The zip pulls had turned green with corrosion and stuck fast. CLR dissolves it instantly but it took a few goes to get the corrosion dissolved inside the zip. I just kept spraying, brushing, then dripping the oil on.Jo Smith
- Bundaberg. QLD. Australia
April 15, 2020
Success on fixing a frozen zipper. Thank you for your suggestions I have fixed a zip on an outdoor couch cover similar to heavy duty type caravanning awnings. It is a very solid zip but was stuck shut. I followed the advice and soaked the stuck end of the zip overnight in white vinegar and to my surprise the next day I was able to unzip it. Once the zip was dry of the vinegar I used a lead pencil and transferred as much graphite as I could up the entire length of the zip. Works well. Thanks again.Jocylyn Noone
- Gold Coast, Queensland, Australia