Prior owner let feed spoil in it & rust holes in the cone. The spoilage line made the holes mostly about 12" above the bottom of the cone...I have solid metal above and below the holes.

Would be nice to find a sheet metal shop that could roll sheet steel the right shape, to lay over the holes from the inside and pop-rivet into the existing cone metal.

...or a solution involving triangular sheets of poly?

Any "tricks" or ideas for repairing holes in the cone of a grinder mixer tank?