I bought a rat zapper and tried peanut butter as recomended on the brochure, but that just melted all over the inside and pretty much dissapeared. I then tried a piece of raw bacon, and haven't caught a rat yet. I did have mine out in the rain, but that was mostly by accident. I didn't touch the thing until all the ground was dry just to be safe. I have only seen 1 rat in my yard, but they say when there is 1, there is probably a hundred! Keep trying!