G`day mate,
this is a reoccuring problem with the protec spray can. If you return it the swap no problems at all. On advice from FFRMAN and in my experience. If you leave her in the sun to warm it up prior to use and as you have done - Shake really well, it shouldn`t be a problem.
It can be a pain in the bum so good luck.
Cheers,
Mick