Hi guys!

My problem is probably going to be really easy to solve but I've tried a few things and I can't work it out, and also googled help for more than an hour, haha.

I've been trying to UV map this model (images attached to post), and I tried cylindrical mapping the sides, but nope, doesn't work and the UV appeared all overlapped. Then I tried planar mapping the top, bottom, and each side, and that worked but when I export it into Mudbox, it says that the mesh isn't complete.

Could someone explain to me why cylindrical mapping isn't working? :S

Thanks for your help