Double click the skybox mesh in the scene
  Static Mesh Actor
    Static Mesh Component
      Override Lightmap Res:  on
      Override Lightmap Res:  0   (zero, this means vertex lit or no light)
    Lighting
      Cast Shadows: off
        




Tiling Content in Photoshop using 3D Layers:
By doing so we can see the tiling in real time

Main menu
  3D
    New tiled painting




Linear Interpolate to blend textures/colors:
Create a constant3 (color)
create a texture (drag a texture in)
create a constant
create a linear interpolate

linear interpolate
  A = Color
  B = Texture.color
  Alpha = Constant

change the constant to adjust the blend





To work in a scene with slow lighting: