Reinforcement bars are actually very safe, when completely covered by concrete. The pH of concrete is perfect for the reinforcement steel, so, as long as this pH has not dropped to lower numbers, or the concrete has not cracked or ... the steel bars will stay safe and sound in the concrete.
But as you can tell, this may not last very long, specially in very corrosive areas, or when a concrete has cracked (due to plastic or drying shrinkage or structural reasons). Chloride induced corrosion is a big deal in coastal areas (like all capital cities in Australia).
To cut the long story short, sometimes you need to repair the concrete and you might get some of the reinforcement bars (reo) exposed. Or sometimes, you might even need to remove some polluted concrete or damaged concrete out, and even some of the corroded reo.
So, whether you need to install a new reinforcement bar, or keep the existing one, you will most likely need to cover this part of reo, before you do the patch repair.
The reinforcement bar will need to be covered with a protective mix. This mix is usually a high performance and low viscosity mortar, which not only covers the reinforcement bar, but also bonds very well to the new repair mortar.
As a solution to this issue, we can offer Bonding Primer and Reinforcement Protective mortars:
Use one of these epoxy mortars, mix them, and use a brush to paint it one the prepared steel bars. It is recommended to finish use the patch repair mortar while this protective coating is still tacky, in order to get the best bonding.