Hopefully he used a rust converter on it before top coating it. Otherwise you aren't really doing much besides cosmetically covering it until it reappears.
I'm sure the northern folks here will agree, but that'll start peeling off within a couple years. He didn't treat the rust even though he removed a lot of it so it will still rust underneath that undercoating.I think he used this.
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And since it is rubberized, it will hold together until there is plenty of rust underneath...I'm sure the northern folks here will agree, but that'll start peeling off within a couple years. He didn't treat the rust even though he removed a lot of it so it will still rust underneath that undercoating.