I once had an old sprayer that was meant to operate on the pressure of a vacuum cleaner (on the exhaust). But I broke the glass jar before I got to try it.
Anyway, I'd like to know good DIY rust treating solutions myself. In the past I've usually just used aerosol asphalt spray on the floor area, and squirted used oil into the crevices, plus doors/rockers/quarter panels, hood & deck lids with a normal oil container/squirter.
The problem with a sprayer is you really need a hoist or a pit to be able to use it properly underneath the car.
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