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Preheat oven to 350 degrees F
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Spray the bottom and sides of a 9x13 inch pan
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Whisk together the flour, baking powder, baking soda and salt, set aside
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Cream together the butter and sugar until light and fluffy
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Add the eggs, one at a time, and the vanilla and beat until incorporated
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Add the flour mixture and buttermilk in small alternating batches and mix until combined
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Spread the batter in the prepared pan
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Bake until golden brown and a toothpick comes out clean when inserted in the center, 35-45 minutes
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Cool
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Poke holes about an inch apart all the way around the cake
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Add 1 cup boiling water to the lime gelatin and stir until completely dissolved
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Stir in 1/2 cup cold water
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Pour the lime mixture over the cooled cake
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Refrigerate for at least 2 hours