BC-28 is a two-part epoxy balancing compound for use in weight addition balancing of electric motor armatures. BC-28 has a smooth, fibrous, putty-like consistency, which keeps the compound from migrating during the balancing process. The two-parts of the putty, parts A and B, are mixed 1:1 by volume or by weight. The Blue Part A and the Yellow Part B are easily mixed by hand until the color is a consistent green. - The BC-28 may then be placed on the motor armature as indicated until the armature is in balance. The working life of the mixed BC-28 is less than 1 hr depending upon mass and temperature. Overnight, BC-28 cures to a solid, which resists moisture and solvents. Mixed material can be frozen to slow cure during an 8 hr period.