In in.local,
J. Clarke typed:
Got a rattle can of Helmsan polyurethane to coat a
plywood fixture that's going to get wet. Well, all went
well for the first two coats, but halfway through the
third, with about a quarter of the can used, the damned
thing stuck open and wouldn't stop spraying. I tried
pulling up on the nozzle and that just made it start
shooting out the top after the nozzle came off. So I
sprayed the basement steps until it was empty (I would
really rather have swept them first but putting something
on them has been on the to-do list for a while so it
wasn't a total waste).

Never had that happen before, usually they clog before
they're empty.

Annoyign thing about this one is that I can't even take
it back for credit--who's gonna believe that I'm not just
trying to mooch a freebie after I used it up?

You'll never know if you don't try. It's entirely possible yours won't be
the first complaint about it, eiother. Those things usually run in batches.