I have tried that one Dave, and found that the paste does not adhere to the metal, but sticks to the Kurust layer, then comes off with a thin layer of Kurust stuck to it.
I have had much better results roughing the metal up to a pure un-rusty clean state, then putting the paste straight on, that way I have found it works a lot better for me, and I have never had the paste come off yet.
Don't know if this will help you Paul? Works for me though.
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