I have only ever used it on a heavy, hard prosthetic (literally almost 1lb of dense silicone), where it works okay, and better when combined with tight underwear to support the balls on my prosthetic, using the waistband to hold it up as well; but I imagine it would be a lot more effective on a light soft packer. I also ended up kind of scratching the back of the popsocket, the part that you use some dermal adhesive to stick to your skin, so that it would attach better.
How long ago was this? There were a couple websites we could use to go around school censors when I was in middle school (hidemyass, lmao) but I definitely don’t remember https being a workaround. For reference my experience was between 2005 and 2008.