Always snap to grid
From Unreal Wiki, The Unreal Engine Documentation Site
This takes a material and scales it. Extremely useful for static meshes that you've enlarged or shrunk to a point where the texture you want to use as a skin looks silly.
- make a TexScaler based on the texture you want
- apply it to the mesh
- set the scale of the TexScaler to fit – you can edit the material properties while you watch the effect on the static mesh actor.