Then I let my gels over night in 5% glycerol in water.The next morning, I dry my gel at 55 degrees C for several hours, under vacuum : the most important is that there is a cooling system for removing the heat, or that there is a vacuum branched on relatively cold running tap water (vacuum).The gels do crack if there is no cooling system with the vacum.Good luck with your SDS-PAGE gels !Daniel