The only way the water can get in is through the bolt holes. The thin rubber washers will do the job assuming none of them are folded/crushed and you bolt it down evenly.
The STI spoilers are notorious for leaking but i've not used any sealant and mines been fine after re-fitting (maybe i just got lucky). I'd fit it and then use a hose to see if anything leaks - and tackle that if you need to.
I wouldn't personally use tigerseal, you'll never get it off without ripping half the paint off with it.
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