Re: Spraying a prepared (de-rusted) steel chassis.
Not sure if it's the case with this particular style of spray-can but in the last few years I've come across various aerosol-cans that are designed with a little 'web' of plastic moulded between the button and the outer-part; this is a security feature to stop people 'spraying' the can in-store as a tester before buying it.
Press the button hard-down first-time and the little 'web' audibly snaps, thereafter it sprays as normal. If you don't realise the web is there, you can still get a sort-of spray by pressing the button so it distorts on the little tube which connects it to the can to open the valve - but keeping it like this involves loads of finger-pressure and the distortion between the tube and the sprayer-nozzle often results in leakage.
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