I've been getting slimed and pied for a while now, but mainly just for fun. Used to have a lot of pictures out there, but now keep a lower profile on UMD.
Anyway, I just recently had the hottest slime experience over the weekend that took my experience to the next level and wanted to share/potentially document other similar experiences.

Like I stated, I've been getting messy for a while. I've always had this fascination with getting slimed in a real gunge tank. The buckets of slime and pies in the face are awesome, but something about a "slime machine" just always held my interest. So I finally decided to just build one like other people on UMD have done--thanks to those for the advice--and see what it's like.

Construction details are boring, so flash forward to fully completed gunge tank ready for use. Usually slime is a fun, playful thing for me, but when I filled up the gunge tank and took a seat underneath it, I was completely rock hard.
My dick was leading the way with excitement and I had this strange feeling of anxiety horniness as I sat in the seat. Realizing this was proving to be a unique experience, I decided to ditch my clothes--I was wearing gym shorts while making the slime--and enjoy sitting underneath 40 gallons of slime butt naked.

Now I'm sitting there with my cock pointing straight up to the gunge vat above me and I'm nervous! I know I just have to pull the cord to the right side of my head and be covered in awesome thick glop but I was anxious. I'm used to getting gunk dropped on me or thrown in my face, so it was a strange feeling.
So I look at my dick and just start jerking. I had my laptop set up for filming, so I decided to watch some porn while I sat there clean and jerked. (Settled on a good flick with a beautiful woman getting rammed for those that are interested.)
Between watching porn and looking up knowing so many gallons of green goo are above my head, I get pretty far along. I've got a good sweat going on and I'm enjoying a really great solo sesh.

After pausing for a bit, I turn off the video and settle back into my seat. I carefully grab the cord in one hand while I hold my rock hard dick with my other hand. I laugh at how crazy this is and get myself pumped to get absolutely covered in slime. I get myself close to cumming again--this time thinking about the slime above my head and how good my musk smells--and decide it's time.
I pull the cord and brace myself for complete slime coverage.

The flow of slime from the gunge tank vat was unexpected and fantastic. Great speed and a "continuous pour" feeling. Not too fast, but not too slow.
I let it hit my head and drop down my shoulders and back before tilting my head up and taking it all over my face like a good slime subject should--I've always liked that feeling for some reason--before moving back and letting my dick get covered. Continuing to jerk my rigid cock, I let the slime coat my entire body. I make sure my arms, chest and back get completely covered and the glop pools around my hairy balls.
When I know I'm about to cum, I take one final look up into the stream of slime and let my dick blast. The slime is pouring onto my face and my dick is shooting at the same time while I'm moaning and cursing how amazing it feels.
Completely drained and my cock overstimulated from my hand and the falling slime, I melt into the chair and breathe heavy as the slime stream slows to a stop.

Best experience of my slime life so far! I'll never want to give up a nice bucket dump from a friend, but I will absolutely be jerking in my new gunge tank from now on!