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Just a quick question, is it normal for there to be a gap along the surface of a mesh once the screw modifier has been applied?

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There can be gaps but they're not inevitable.

  • The Angle should be 360° so the edges line up.
  • The Screw value should be exactly the same value as the object's dimension in the relevant axis.
  • The highest and the lowest vert should have the same distance from the screw axis.
  • After applying the modifier, using Remove Doubles with the relevant verts selected and a large enough threshold should kill any small gaps. Without that, a Subsurf Modifier might produce a gap.

enter image description here

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