I'm doing some landscaping and will be installing some of this rusted edging.

https://www.bunnings.com.au/whites-1180mm-garden-edging-strip_p3042362
One of the garden beds I'm using it on will have it running along my aggregate concrete. I don't want to get rust stains on my concrete so wondering which product you recommend for sealing it to prevent the run off and staining.
TIA