A zanuzzi kitchen Hob with four gas burners has the steel Top Caps rusting. (They Comprise of Steel Discs with an enamel layer on the top side ).
They are dropping Masses of Rust from the Steel under side on to the gas nozzles below.
I have tried burning lubricating oil on to the steel surface to seal it, but this only lasts for a short time.
The issue is that very small bits of rust are likely to drop into the gas nozzles. Grateful for any ideas