clear gasket maker here!
talk about cheap... but it's been working a treat (bout 6 months now). just applied a small amount around the seam of by the crack (about 2 inches) and "smoothed" with my index finger. It's hardly noticeable (to non P-car owners lol) and it's been leak-free since application. It did well through the ice and nasty weather as well.
just another cheaper option for the even cheaper than cheap