A very good and comprehensive assessment of what is taking place with MX5 Rust issue’s Thanks, Yes I agree with your point about using hammerite as a ‘ stop gap ‘ aid in holding the rusting process back …
The thing is To do the job properly can cost a great deal of money. Many MX5 owners are either quite elderly and pensioners etc And sometimes a stop gap is their best remedy, Thanks for a very enjoyable update … Most enjoyable Best regards from Ray in the Epping area… Essex
Most of the rust on a MX5, any model, is going to be from the inside out. No amount of Hammerite, Genolite, Rust Converter, is going to hold that back. The fundamental issue is that none of our cars has a roof joined to the body. Water on a soft-top is deliberately directed through internal drainage routes not seen on a tin-top (unless said tintop has a factory sunroof, which are well know to causing rotting, due to blocked drains etc). Plus because there is no roof, in order to stop the car wobbling like a jelly, Mazda has to, like any other roadster manufacturer, add internal strengthening sectons, all of which are designed to strengthen the car, rather than avoid creating new rust spots. When Mazda designed the NA, they created a sill section that includes a substantial non-draining section which, guess what, rots out. Bit of luck whether any aftermarket chassis wax can be introduced into that pocket to the required coverage, without being overly thick and, counterintuitively, accelerating rust (through creating a sink spot).
Using Hammerite I suppose has a placebo effect fpr the owner; they feel they might be making a difference, with no control as to indicate whether they did.
The statement that a sports car has become the OAP vehicle of choice seems a bit sad. That’s not the market it was created for. If true, the car is going to outlast them.
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