The problem with any type of pseudo defence is that once you have scare the bejeezus out of them, nothing stops them from coming around again and spraying your boat with gunfire from a distance.
I think I've suggested this somewhere before, can't remember.
If an obviously belligerent vessel comes alongside and a parachute flare is fired into it's accommodation, the resultant fire will keep them busy for a while. A second may be too much to stop and the vessel will burn to the waterline. Whichever you manage to achieve, they will be reluctant to come back because your flare has range enough to be dangerous from a distance. Of course a Molotov Cocktail tends to attracts the receiver's attention as well.
The next problem is at what point do you decide that the occupants of an approaching boat mean you harm? Some of the "naval" vessels we have seen as well as many a well-intentioned fisherman look like a bunch of cut-throats. And by the time they're on board, unless you're Jacky Chan, you're toast.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke