I actually just smeared mine all over with solder paste, then pushed it down with tweezers when hot so the excess spilled out the edge as little balls. Then when cool you just run around the edge and the balls drop off.
I was using leaded solder, but I guess if you're using normal temp unleaded paste you might need to get it so hot before the paste melts that the module has issues? You could try getting some low temperature unleaded paste to try - as far as I can tell there seems to be very little downside to using low temp paste.
I've heard of folks laser-cutting stencils out of mylar with standard laser cutters, so you could always give that a go? But again, I never actually bothered with that.
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