I'm in the process of removing my front subframe and intend to get it dipped to remove all rust inside and out. It will then be primed and baked. (The rear was too far gone so had to be replaced)
Not sure if anyone as any experience of this but I'll let you know how it turns out. It's not particularly cheap, but a lot cheaper than a new subframe, even allowing for new bushes.
When it comes back I'll coat outside in chassis paint and inside with cavity wax so hopefully should last a few years.
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