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Size CoatThe second layer of adhesive bonding, referred to as the size coat has two main purposes. The first is to tie the individual grains on the abrasive face together, so that they act as a unit instead of as individual grains. The other function of the size coat is to act as a heat shield for the grain. As previously discussed, most of the bonding agents in coated abrasives are phenolic resins, which after curing, are heat resistant.Too much size coat or too little size coat can cause perfo …