Some spring form pans allow water to seep through and RUIN your cheesecake! Usually it is recommended that you use tin foil. My tin foil, however doesn't cover the entire diameter of my spring form pan, so it STILL lets water seep through because of the seam. Something I've found INCREDIBLY useful, though, is an oven bag. Oven bags are wide enough to slide your spring form pan in, and you can just cut it down to the height of your pan. SUPER HANDY!