Frequently Asked Questions

CAT - Electronic Rust Protection System
Corrosion Block
Oxycon
Zinga

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CAT

How does the CAT work?
- The CAT electronic rust protection system converts the 12 volt battery power to 4,500 volts of pulsed charge. This is transferred to the vehicle via the sensor component. Eventually an electron charge builds up within the metal work (trapped by the paintwork). This charge interferes with the normal rusting process reducing the rate of corrosion by 80%. A more detailed explanation can be found at www.rustguardian.co.uk.
How much power will the CAT draw and will it flatten my battery?
- The CAT unit draws 175 milliamps and is designed to turn off at 12.2 volts.
How long will the CAT unit work before turning off?
- The length of time a CAT unit will function depends on the battery capacity and total vehicle current draw. Normal regular use ( once or twice a week) should keep the CAT unit functioning. However in circumstances where a vehicle is used irregularly a conditioning charger or a boost charge will be necessary.
Will the CAT effect other car electrical components?
- No. The CAT will not effect other electrical components.
Will The CAT unit work on existing rust?
- Yes. The CAT electronic rust prevention system will stabilise existing rust and slow its progress dramatically.
Will the CAT unit work on all cars?
- No. The CAT unit is designed for negative earth vehicles. However, if a car is in storage it can be protected by disconnecting the vehicle battery and running the CAT from an external power source of appropriate voltage.
Will the CAT system help to protect the aluminium on my Landrover?
- Yes. The CAT will reduce the sacrificial electrolytic corrosion of the aluminium.
How will I know the CAT unit is working?
- The CAT unit normally buzzes quietly, this can also be heard at the sensor. The fixing of the sensor and the thickness of the metal also effects the volume of the buzzing noise. The rate and volume is also effected by the voltage of the battery; the higher the voltage the higher the frequency.
How big is the CAT unit?
- The CAT generator is about the size of a video cassette and the sensor is approximately 60mm x 90mm. The sensor unit must be fitted on a flat surface to be most effective.
Is the CAT unit easy to fit?
- The CAT unit is normally easy to fit in most cars. The main problem is the siting of the sensor as it needs a flat surface. The generator to sensor lead cannot be extended as it is a special low impedance wire of 800mm in length. This limits the location of the generator, however, the power supply leads can be extended as required.
Will the CAT unit protect the entire vehicle?
- The CAT unit protects 95% of the vehicle, but those areas without earth continuity or insulated from the main body will not receive protection.
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Corrosion Block

Can you paint over Corrosion Block?
- No Corrosion Block cannot be painted over as it is an oil based product. The finished film although very thin and dry to touch will not accept over painting. In the event that you wish to treat or paint a surface treated with Corrosion Block, it will be necessary to degrease the area first.
How long does Corrosion Block last?
- Corrosion Block is effective for up to 18 months dependant upon the area treated. Locations such as box section or under rubber surrounds will last longer than vehicle chromework or alloy wheels.
What is the best method for applying Corrosion Block?
- Corrosion Block is designed to form a very thin film, only 4 microns thick, and as such the manner of application will vary dependant upon location. Neither the pump spray nor the aerosol atomise the fluid effectively, so it often best to also use a small paint brush or cloth to spread the applied fluid. The golden rule is use it sparingly as it goes a long way.
Will Corrosion Block effect plastic or rubber?
- Corrosion Block is virtually inert to most materials. It can be used on electrical items, switches fuses and relays. Refer to the Corrosion Block document under further information.
What is the shelf life of Corrosion Block?
- Corrosion Block has a long shelf life provided that it is kept airtight and not contaminated with water.
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Oxycon

Can Oxycon be overpainted?
- Yes Oxycon can be overpainted. Once cured Oxycon will accept most primers, fillers and paints. Refer to the Oxycon document under further information.
What is the shelf life of oxycon?
- Oxycon has a long shelf life as long as it is stored in a frost free environment, kept airtight and free of rust contamination. Once again refer to the document in further information.
What surface preparation is required before application?
- Prior to the application of Oxycon all loose rust must be removed, using a wire brush or similar. If there is the possibility of salt / grease contamination the area should be washed thoroughly and allowed to dry prior to application.
Do you need to wash Oxycon prior to overpainting?
- No The hard dark polymer finish of Oxycon is ready to receive most primers and paints without the need for further work.
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Zinga

What is Zinga?
- Basically Zinga is high purity zinc in a solution of solvent. There are certain additional compounds which assist in its application.
How does Zinga work?
- Zinga protects the steel by forming an electro-mechanical bond. The zinc is sacrificial to the steel and protects in just the same manner as hot dip galvanising.
Is there a special preparation required for Zinga?
- Yes. The metal surface to which Zinga is to be applied needs to be prepared to SA2.5 specification. This is also the standard required for other other protective products. If you have any queries please ask for advice.
How is Zinga applied?
- Zinga can be applied using brush, roller or spay gun. It will need to be thinned using Zingasol for the latter.
What is Zinga’s shelf life?
- Zinga has a long shelf life, but may need the application of Zingasol to maintain workability is used for small jobs and continually resealed.
What is the coverage of Zinga?
- In one coat applications, prior to over painting, Zinga will cover approximately 1 sq meter. We have calculation tables which will enable us to give you an accurate assessment of required volumes dependant upon area and thickness of application. This is also true for the Zinga and Zingalu aerosols.
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