Full body casting is probably the most severe and secure form of bondage.
Five or six years ago, I mummified my husband and had him restrained for two days. I would have gone out of my mind if it was done to me, but he loved it.
First, I put him on a liquid diet for 24 hours. Then I gave him the requisite five, three quart enemas that I made him hold for ten minutes each before expelling to make sure his colon was clean. After that, we waited about two hours for any remaining enema water to come out. A Foley catheter was then inserted. For the rest of the scene, I had two of our very closest female S&M friends give me a hand. I stood him up next to our bed with his arms by his sides and covered his nipples, cock and balls and anal areas with cotton puffs that I taped to his body--you'll see why later. Next, I wrapped him with 1000 feet of six inch wide stretch wrap, that you can get at the UPS store or U-Haul places for packing. (1000 feet of the stuff isn't really that much when you see it on a roll, but it will certainly hold your victim still once it is applied.) Now that he was largely restrained by the stretch wrap, we wrapped him with five rolls of duct tape. This really made him mine. He had never before or since been so tightly bound and immobilized. After we finished with the tape, we went back to his nipples, cock and balls, and anal areas that had been covered with the cotton puffs, and carefully snipped off the duct tape and plastic wrap to expose those delicate areas so I could play with them later.
He was allowed to drink fruit juice through a straw, and when nature called, the catheter and urine bag did its job. As others who have read my posts before may recall, in an S&M scene, I love to masturbate men almost to the point of orgasm, and then just stop. I had a got to do this several times during these two days! Having his nipples exposed would have been in vain if I had not applied nipple clamps a few times. For that cute and exposed anus, the small bipolar butt plug connected to the ErosTek ET312-B gave ME a lot of pleasure! (I would have used the large butt plug, but the duct tape prevented me from spreading his butt cheeks far enough to insert it.) Just for fun, once each day, I took out the butt plug and inserted a colon tube about eight inches and gave him small enemas. After all, with his body wrapped, there isn't room for the enema solution to expand the abdomen, so less than a quart was all he could take. The tube was left in so the enema water could just drain back out into a closed top bag. He didn't dare let any solution leak out of him. After the enema solution came back out and into the bag, you could see that his colon was absolutely spotless from the liquid diet and enemas prior to his mummification. The water had just barely turned a chicken soup color and there were no solids in it at all.
One of my two friends and I were with him all 48 hours to make sure there weren't any emergencies, except for the few minutes when one of us was in the bathroom. We also checked his oral temperature and had a home model continuous reading pulse oximeter running. Just to keep him turned on, and to amuse myself, I masturbated a few times while lying in bed next to him. Every so often, I'd grab his erect cock, with the catheter in place, and give it a couple of strokes with my hands wet with my pussy juice. I also had the Sunday New York Times and several magazines that I read completely from cover to cover. We did have the television and music playing at various times, it wasn't my intention for him to have sensory deprivation.
Anyway, when the time was up, we carefully used bandage shears to snip off the tape and plastic wrap. He was hungry and horny and after giving him about 15 minutes to get his body moving again, I gave him a bit of food and a good hard fucking.
I loved the experience almost as much as he did, but having our daughters be away from the house, the amount of work, planning, and especially the need for "assistants" is greater than a regular two or three day S&M scene that we have once or twice a year, has made it impossible do to since then.