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I'm trying to UV unwrap the inside of a barrel I made.

The problem is, when I select the inside of my barrel, and use the
Mesh > UV Unwrap... > Cylinder Projection, I get a weird unwrapped form. How can I solve this?

Unwrapping the barrel inside

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You could also look at the options at the bottom left corner in the tool menu (Where you change settings when adding a cylinder for example) and select "Align to Object" from the Direction menu. – user3184 Jul 12 '14 at 1:10
up vote 3 down vote accepted

Cylinder Projection is based on the angle of the view.

Try switching to front (Numpad 1) or side view (Numpad 3), then unwrapping again:

enter image description here

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It worked, see my result. Thank you! :) – maxdev Feb 4 '14 at 21:49

Blender's automatic UV unwrapping doesn't always work correctly. You can do it manually easily if you mark(CtrlE > Mark Seam) the top seam, the bottom seam and one seam down the middle:

enter image description here

Then unwrap (U > Unwrap):

enter image description here

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Aside from the ideas above you may also try applying the Location, Rotation and Scale in Object Mode using Ctrl-A.

Not doing so will really screw up a lot of the various operations in Blender, this includes UV unwrapping.

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Don't count on the order of the answers to stay constant. Refering to answers above yours will not work when your answer is voted to the top. :-) – Gunslinger Feb 4 '14 at 21:53
yeah, I forgot about this. Thanks. I'll leave it the way it is so people will learn from my mistake. – MarcClintDion Feb 4 '14 at 23:18

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