Sand down large surfaces or tiny details.
Landform models, glue joints or intricate surface details in archritectural models, dioramas and craft projects.
Just sand joints after glue dries and achieve perfecty invisible joints.  Sanding can be done with emery board, sanding paper and pads, even power sanders.  Make topographic models, any cutting mistake can be corrected by sanding to achieve perfect curves on your topo landscape model, site model etc.   Sand down steps to create a smooth topographic model, diorama,  mass model.  For more on painting, forming, cutting, and model making with Taskboard click here