In the event the steel is substantially corroded, then omit Hydrate 80 and use Electrox, never use both together. So the choice is either Hydrate 80 or Electrox depending on cleanliness achieved at the prep stage. dynax S-50’s soft-film is optimised for enclosed cavities where extremely corrosive conditions develop. dynax S-50 is also recommended for protection of valuable machinery and component in transit, machine tools, moulds etc. dynax S50 can be removed using suitable solvent. dynax S-50 is not formulated for prolonged exposure to ultra-violet (UV) light. The final picture in the series below shows dynax S50 protected metal is still in exceptional condition. These standardised test panels have been removed from an ASTM B-117 hot salt spray trial after an extremely aggressive 2000 hours – the rear of the panels show that the steel left unprotected is almost corroded through. You mention too, Hammerite Stonechip which is fine, but seeing that you don't get much ballistic damage in the arches believe it or not, its not ideal. Use that on the chassis underside, the valances etc. Bear in mind too, that you get a hell of a lot of flexing in modern wheel arches. Use a New Technology product that is flexible and stretches and one that can creep into weld seams, screw threads etc. Also, if your car experiences massive swings of humidity (such as being driven outside during the day, and going into a warm garage at night) you need to make sure that it doesn't peel off, as some older more traditional products are prone to do. ASTM 117 only tests for resistance to corrosion, many manufacturers don't bother with testing for humidity as well. Some products are formulated specifically to pass 117 (or ISO9227), and as a result, are rigid in a molecular sense and aren't too flexible. Dynax is 3-4 times more effective than other waxes, and I can say that hand on heart. I think I said elsewhere, that if I had a decent new car, I'd use a cavity wax on it, and certainly on a bog standard car that's just a few years old.

https://cdn.opieoils.co.uk/images/variants/medium/bilthamber/bilt-hamber-dynax-s50-750ml-aerosol-5.jpgThe advanced metal seeking anti-corrosion molecules which form Dynax-S50 are able to displace water, so even damp surfaces can be protected, these same molecules arrest and prevent corrosion even on already rusty surfaces and provide remarkable self-healing abilities if the film is damaged. Whilst Dynax-S50 is primarily a cavity rustproofing compound it’s also able to prevent corrosion in a multitude of mud traps and water collecting voids. Dynax-S50 has been used with superb results to protect voids and cavities in steel boats, vessels, offshore installations and other steel structures subject to severely corrosive atmospheres. Dynax-S50 is designed to protect steel surfaces in extreme conditions. It’s well known that vehicle cavities are subject to a wide-range of corrosive environments, from salt spray to high humidity, heat, fresh water and freezing. The cavity wax chosen must cope with all these variables and continue to provide the necessary protection – maintaining the structural integrity, safety, and value of the vehicle. It’s common for manufacturers of cavity waxes to quote salt-spray results in hours for their cavity waxes and while the salt-spray test is severe it’s been shown that waxes with very good salt-spray performance can rapidly deteriorate when the environment changes, for example after a period of constant salt-spray they swell become bloated and detach from the surface in an atmosphere of high humidity alone. Dynax-S50 has been proven to provide outstanding salt-spray protection and continuing protection in changing conditions with no swelling or detachment whatsoever. You’ll see below how Dynax-S50 compared with two extremely well known cavity waxes in constant salt spray trials.

Class-leading long-term protection for cavities, voids, chassis, doors, mud traps machinery, boats etc etc

Quick Guide

Unlike traditional paints and coatings these molecules are not bothered by corrosion products and so do not fail when applied to pre-rusted surfaces. Dynax-S50’s soft-film is optimised for enclosed cavities where extremely corrosive conditions develop. Dynax-S50 is also recommended for protection of valuable machinery and components in transit, machine tools, moulds etc. Dynax-S50 can be removed using suitable solvent. Dynax-S50 is not formulated for prolonged exposure to ultra-violet (UV) light.

dynax S50 is tolerant of a broad range of application pressures and will form a coherent film upon application. dynax S50 will increase in viscosity at low storage temperatures.

dynax S50 is a high-performance anti-corrosion wax that provides exceptionally long-lasting protection to steel surfaces. It creeps into welded seams and seals surface defects. dynax S50 forms a soft, brown, wax-like film that self-heals in the event of disruption. It is also able to arrest existing corrosion and to provide long-term protection to pre-corroded and corrosion-free surfaces. it's not in direct shot of tyre spray, but some may hit on the inside of the arches and drip down into the lip (the lip is of main concern really, but while i'm there, i shall most likely spray S50 in the surrouding area), so it's not going to be hit with a great deal of force as such.