Switch plate adapters comprising a body, at least one aperture and at least one hook for permanent or temporary attachment to existing switch plate covers are provided. The non-monotonic rheology properties can be such that in the relationship between shear stress versus strain rate }), where {dot over }1<{dot over }2<{dot over }3<{dot over }4, the shear stress values are \u03c31<\u03c32\u03c33\u2266\u03c34, and \u03c33<\u03c32 The method can heterogeneously deposit proppant or solid acid in a fracture. The base composition may include a plaster and an active agent, and it may further include at least one of a water-soluble binder, a non-water-soluble binder, and a lubricant.