OOC:
Sorry, yes as well as Luck being something I might ask you to roll against, it can be treated as a pool which you can spend to force a roll (with the exception of combat and sanity) to succeed, depending on how important you judge it to be. This pool is doesn't regularly replenish like health so expending this much is a lot but the option is there.
The alternative is to Push, doing something with extra effort- this allows you to try the roll again and if you fail something bad might happen (even worse than failing the first roll!)