I love head dunking especially in custard or natrosol gunge. I love holding my breath in there as well and also bobbing for stuff like tomatoes or jelly snakes and then dropping them into my speedos or latex underwear.Feels so good having your briefs fill up with gunge and soft jelly candies or tomatoes
Love the feeling of the slippery gunge all over your naked body
Never done full body submerging but would love to

Also have to point out I just love the way my body tingles and shivers at the anticipation just before you get gunged when you're still clean and dry and know what's coming next

I prefer an engulfing sensation and the weight of heavy mud. As well as that first trail of Gunge/slime that runs down the sides of your face, down your back, and your stomach.