This flush water may be retained and reused and strengthened as required. Replace after several uses as salt will build up in the solution. For first time flushing using this method, flush engine for 30 to 40 minutes. A nylon stocking may be placed over the propeller exhaust so that you can see the amount of gunk flushed out. The elements necessary are water and air in contact with metal.
All commercial metals contain impurities which, like salt water, accelerate any natural breakdown.
Examples of this breakdown are the rusting of iron, the corroding of aluminium and the greening of copper. Removing any one of the necessary elements stops corrosion. Whilst impurities cannot be removed, salt, air and water can be prevented from contacting the metal by application of MACS Ultrafilm. Therefore, corrosion occurs during actual use of the boat. Application of MACS Ultrafilm before use protects against corrosion during use.