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When all the paint etc. and corrosion has been removed the item is cleaned with compressed air to remove the residues of the cleaning media. The steel surface is grey in colour and "technically clean". However, steel panels in this condition are very susceptible to surface corrosion from moisture in the atmosphere and even the sweat on your hands. It is essential the surface is protected as soon as possible but we do not think priming the surface is the best solution. Primers are not waterproof in most cases for one thing and any paint should be removed locally if welding repairs are to be carried out. In addition, primer will hide the surface so you cannot see the metal to see if it is clean and sound.   

We spray the body / panels / parts with a zinc phosphate coating that is a clear product but leaves a slight green tinge in some areas as it works into the metal. You can still see the metal surfaces - and see if we did our job properly because nothing is hidden behind a coat of paint or electro coat finish. Our Zinc phosphate treatment is an advanced coating that etches into the metal drawing zinc into the surface. It also has corrosion conversion properties which help to stabilise the invisible corrosive salts that are ever present in the metal where corrosion was previously visible. You can weld through the treatment without removing it because it isn’t a paint.
This zinc phosphate treatment can be left on the surface and overcoated by any kind of paint. (In the 20+ years we have been importing the product no-one has reported a paint compatibility problem.) The surface should be rubbed over with a Scotch-bright pad to remove any dust or loose particles, blown off and/or solvent wiped prior to painting, just as you would normally do for good paintshop procedure.
The phosphate coating is not intended to be exposed to direct contact with rain etc. but will protect the metal quite well for months in a reasonably dry workshop. A customer recently reported that a car body we cleaned, which had to be shelved for 4 years, was rolled out again and found to be in remarkably good condition, protected only by our phosphate treatment.
Since the coating is transparent it will not obscure problem areas that blasting has revealed.  You can clearly see where corrosion has eaten right into the metal, giving you the opportunity to cut out and replacing parts as necessary.   
In addition to phosphate coating, we now have full facilities for hot metal spraying which is ideal for protection against corrosion, or just for decoration. Hot metal spraying can be applied to virtually any metal surface—and some non-metallics. This is ideal for classic car chassis parts, the zinc or aluminium is sprayed onto the outside of the chassis or parts. It is like galvanising without having to send the parts away for immersion. Of course we can only spray what we can see. Aluminium is sprayed onto the exhaust system because it looks good and doesn't discolour from the heat of the engine when the exhuast pipes glow red-hot.

Many other items such as garden furniture, gates and railings, even architectural and ornamental items can also be hot metal flame sprayed with finishes like zinc, aluminium, copper, bronze or stainless steel, and even some non-metalic surfaces can be sprayed. Generally the sprayed metal surface is slightly rough, like sandpaper. You may need an etch primer if you are going to paint over the metal spray.