so my box is 8' x 2' with two 4x2 sheets of hdpe 3/8in white plastic, about the same as what you see at your local mountain parks. so my question is what should i use to make the surface slick, i have a 14 foot drop in, 8 foot flat then a 2 foot ramp to get on the box, and id rather not stick when im on it. some say cooking spray some dish soap some wax and other say just water so whats your thoughts on this? i know pvc is better because its slicker but i didnt feel like doing it the cheaper way so i spent about 300 on wood and 100+on the sheets. this is my first set up and id like it to be done right so it can last for a few years. thanks for the help!