Moin,Moin something is always…… have found today with terrifying that my elk is rusted left and right under the plastic covers of the door sills. The places are easily accessible after disassembly of the plastic covers and fortunately only about 20cent large (one left and the other right). The rest of the door sill is top. I have to close in front of the holes with synthetic resin. I want to treat the metal with zinc spray or prime it. Since I have dismantled the plastic covers I could spray through the fixing holes a cavity seal. Does anyone know a good sealing ?