I fully expect that Handwavium coming into contact with nanotech would, worst case, merely be subject to the Slapstick Effect. Or, perhaps, would have no effect at all except to absorb the nanos and leave you with slightly more Handwavium than when you started.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor