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Ever in that situation when the wind direction and strength is perfect, ready to pull out your kite on the beach only to be frustrated with a stuck kite bag zipper? Reading some other posts, this for certain makes is a re-occuring problem, blaming zipper quality. As will be explained, zipper quality is not at fault. I faced the same problem with three of my kite bags. No amount of jiggling, cursing nore huffing & puffing would loosen that zipper. I tried WD40 which did not help. I tried brute force which did not help. These zippers were recognised else where as quality zippers, YKK. There were no signs of corrosion. So I thought that it might just be salt crusting up the zipper, so I immersed the whole kite bag in warm fresh water, added a bit of sunlight soap, to disolve the salt both from the zipper and the kite bag as a whole. I then took a sewing needle and poked it inside the zipper head until it went right through the zipper head and out the other side (in the direction of zipper travel). Repeated this a couple of times, wriggled the zipper head some more and it finally released, only to reveal losts of crusted up salt. There was no sign of corrosion on the zipper head since it was made from stainless steel, no corrosion of the zipper teath since these are made from pastic. It appears that the metal zipper head attracts the last bit of moisture left in the kite bag and the salt seems to wick to that location and as a consequence builds up there over time. Lessons learnt; rinse out the kite bag every once in a while; don't do up the zipper all the way up, leave a centimeter free which makes it easier to unlock when cruded up.