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More like 24 hours - longer still if cold, and possibly much longer still if using rattlecan to avoid issues with the paint having a different solvent base (spray paint won't play nicely if there is any residual water in the primer). I left my last project in the loft in summer for a week between Kurust and brush on enamel...
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wait an hour
The instructions say 3 hours. There's a little propylene glycol methyl ether in there, but otherwise it's basically a cold bluing solution, what doesn't get consumed in the conversion reaction will just wash off with water. As MrE says, making sure it's properly dry before painting is important.
am prepping a frame to move my commuter bits from a Marin BV to a slightly larger Marin BV: I have Kurust. Does it need a long time to cure or can I give it a sloosh > wait an hour > build?
*cure/evaporate/whatever