State two methods by which rebar can be protected against corrosion. Solution The two methods by which rebar can be protected against corrosion are 1) SEALERS - Sealing the rebar with products such as epoxy coatings, linseed oil emulsions, acrylic sealers etc. 2) CATHODIC PROTECTION - Cathodic protection stops corrosion of rebars by reversing the electrochemical process of corrosion..