Have you removed the electrical tape? ;)

I banged on mine with a rubber mallet and it popped free...

In a sandy environment, the best action is to prevent sand from getting in there in the first place.

Wrap the joint with tape. 1. This keep the sand out. AND 2. it keeps the mast from gapping during rigging.

tonyk said..
www.seabreeze.com.au/forums/Windsurfing/General/How-to-separate-stuck-mast-using-car-jack?page=1

Don't do this.
You'll **** up an expensive mast.

Like many of you, I have helped several people separate mast sections after a windsurf session. I'm not saying I'm an expert on this but I have made several repeat observations.

1) The mast jams because sandy or silted water has got inside and the water escapes but the sand or grit is left behind.
2) Because of 1) its a good idea to check all your mast bungs and the mast tip are in place, because that's where the water usually gets in.
3) If you can be bothered to tape the joint each time you sail then this is a good idea, but it won't work if the mast bungs are not in place. (See above). I don't tape my own mast joint.
4) Your first reaction is to attempt to twist the mast apart, often with the help of others. This usually works, BUT if the mast joint rotates but the two sections stay together then, ooops, that's a sign that one big bit of grit is inside and when rotated it scores a groove into both sections of the joint. That grit then holds the joint together and you've made the situation worse...
5) Masts are fragile, and the expensive ones even more so. Do not use mechanical means to separate an expensive 100% carbon mast. No winches or car jacks. No attaching one end to a fence and the other to your car which you then drive away. These are blokey things to do, and you'll feel better in applying a macho solution - but it'll usually ends in tears. In particular, the problem usually comes when you attach some rope or webbing which crushes the mast sections, a crush load mast top sections are not made to take. When separating a mast with the help of others, watch out when an Alpha male tries to take over.
6) Applying a boom on each section does allow relatively few people to gently rotate the mast sections at the joint. If they pull from each end, then the mast should come apart straight away. If it doesn't then a bit of stubborn grit will quickly make the issue worse. See point 4).
7) Take out the mast tip bung (in the top section) and get a water hose inside the mast to rinse out the sand. Shake the mast from one end in a whippy motion, and repeat the water treatment - as that's how the sand got in the joint in the first place and reversing the process with water from a hose can release the joint.
8) Another solution which can work is where you place a bag of ice on the 'male' section and wrap a hot towel over the 'female' section - using hot kettle water - the obvious aim being to shrink the spigot whilst widening the hole.
9) In bad cases, remember that a mast can cost a lot of money and there is no rush in trying to separate it. In my experience, most people have ****ed up their mast before they try the hose solution.
10) Avoid all these problems by reading points 1) and 2) again.

Plug the bottom of the mast with a spud so it seals tight then using a compressor blow gun stick the end in the mast tip and the pressure should pop the mast apart, never tried it but there always a first.

for me the stuck mast has always been because the bung or end cap isn't sealed properly as basher has said.

recently the guys at the beach showed me 2 new ways of separating masts.

first method.
hold the mast vertically with the tip on the ground and just shake it for a few minutes.
the wobbling crushes the sand in the ferrule.

second method.
hold the mast at the tip with the bottom end up in the air. like a pole vaulter. then let the bottom end drop and hit the grass while holding the tip.
this wobbles the ferrule and crushes the sand.

I have never taped my masts. and never had one stick. until the bungs come loose. then they get stuck every time and continue to stick until i wash them out and redo the bungs.

i reckon sand fits through an extension easier than a ferrule joined under load. i mean which one has the 6mm holes in it.

I don't tape .
Im a live on the edge kind of guy

slowpoke2 said..
Just go retro and tell everyone it's a one piece

They would be better masts, and lighter!

Gestalt said..
I have never taped my masts. and never had one stick. until the bungs come loose. then they get stuck every time and continue to stick until i wash them out and redo the bungs.

i reckon sand fits through an extension easier than a ferrule joined under load. i mean which one has the 6mm holes in it.

Agree as my 460 was getting stuck and no bung. I had a small can of expanding foam I was going to use, spray then plastic bag over and and turn upside down. Of course the can had been sitting around for too long
I used silicone

I still have a one piece Kiwell 430 that I use