A coated abrasive article has a backing treatment preparable by at least
partially polymerizing an isotropic backing treatment precursor
comprising polyepoxide, polyfunctional urethane (meth)acrylate,
non-urethane polyfunctional (meth)acrylate, acidic free-radically
polymerizable monomer, dicyandiamide, photoinitiator. Methods of making
and using the same.