Removing brushed on RUST-OLEUM from axle housing?

The ones we use are a 4 inch twisted strand with like 8 or so finger type strand bundles. Flat with a threaded center to spin on to the grinder. It's what we used to strip our housings on our 8.75. They are a single pack, about $5 each. I think they sell a 3 inch one as well. They do shed after time.