I've had great luck with this.
gallon size at Mills Fleet
it STINKS when first applied - don't do it in enclosed space unless you need to kill cockroaches at same time
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my success was with ice fishing popups and mostly their skirts - not tents by the way
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respect anything made of waterproofers (PTFE)
wear gloves and a mask when spraying this stuff from a cheap pump-up sprayer or spray bottle - once dried it's less of a risk but don't roll around on it for fun
once this crap gets in your body you are stuck with it - literally - and science is arguing right now about what this means for health in the long term
fire extinguisher foaming systems are made of this same "teflon" chemical family and now they are finding gigantic plumes of it in the groundwater under every place the foam was used for accident, training, etc.
the military is now spending BILLIONS just to find out how badly this stuff effed up the groundwater
now you know
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^^^^ firefighters unwittingly creating a multi-million dollar groundwater investigation down the road