and what materials you use please? 
I use either animalintex and vetwrap (needed if hot/wet poulticing) or cheap nappies are easier if bandaging dry. Make sure it goes well over the bulbs of their heels, almost up to the fetlock, keep it tight over the hoof but obviously allow for movement on the soft/ moveable parts I then cover the whole thing in duct/gaffer tape- the wetter it is the more you need- a minimum of 3 layers for a shod hoof on soft grass, up to 10 layers for shod hoof on stoney ground! Use lots of short lengths of tape rather than wrapping the whole thing round and round as this will keep it smoother, as every crease will let in water! You need a good tape, best cheap one I've found is from wilkos, failing that get proper brand expensive tape, not own brand stuff. Look for thick tape, it should look textured from the outside. not smooth- that way you know there's a lot of thread and stuff in the tape so it will be stronger.Oh, and it's really fun having a conversation with your mum in tescos over what size nappy you think you'll need- especially when an assistant comes to help you and asks how old your baby is!!! (if you are going for nappies get quite a big size unless its for a little dainty pony)
). This is made by cutting say 5 strips of duck tape, about 6 inches long, and sticking each strip to the side of the previous strip to make a square. Then repeat process, except stick strips crossways across the first square. So you have a reinforced square of tape.For an unshod hoof, on full turnout, I have managed to get poultices to stay on reliably for 24+ hours using:
Animalintex on hoof.
Half a roll of bargain basement vetwrap (none of that expensive 3M stuff for us).
A "raft" of pound shop duck tape (cost £1
Once poultice and vetwrap are on hoof, I just roughly centre my duck tape square on the sole of the foot, slap it on and then fold it up the sides of the hoof, sticking it to itself. Finish with a strip of duck tape around the outside of this, and trim off any bits that are sticking out. At this point, I usually cut into the vetwrap underneath so it's not tight around the hoof.
If I was doing a shod hoof, I would add the corner cut off a plastic feed bag under the duck tape but over the vetwrap, for extra reinforcement.
Or do you think it's better leaving it as a full square? http://www.thehorse.com/Video.aspx?n=how-to-poultice-your-horses-hoof&vID=604
). You can use a lot less and still have a poultice that stays perfectly in place. But if you can, it is so much easier than wrestling with scissors and trying to find the end of the roll of tape...
Although it will only have to go from the tack room (there's a handy table in there ) to the yard so I should manage!