The rules simply say make an arcanotech skill roll to use the slap patch successfully. A normal skill roll is an open roll, so I don't see a compelling reason why this should be any different. (In fact, I can think of very few times when closed rolls are needed in 'Shui.) Just be aware that the patch description specifically says there are no negative wound points, so even if you screw up the roll, I wouldn't inflict more than the required 4 wounds points for failure.
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