Yesterday I had a wonderful session with 20 liter of the best slime I have ever created. I bought three liquid ready to mix wallpaper adhesives of Meylan. It is a bit more expensive as the powder product but you will not have any problems with the mixture going lumpy.
I then added Rends Bath Slime, about 1/4 of the bottle. This product is made for converting your water filled bath tube into a lotion paradise. Adding this to the wallpaper paste will result in a very slimy experience with a slow flowing liquid that will make strings by stretching it and will cover your body in a thick layer of slime. The result reminds me of the secret recipe of Jayce and Jilly. After the mixture was ready I charged four buckets with different UV glowing pigment colors and turned my UV lights on. Damn this was a great time! Feel free to try it out
* So the basic element for the slime is Methyl Cellulose or Natrosol based on your country. In general chose a product for wallpaper paste, these products are most time in powder form so you have to mix them with water by yourself. * Choose the lowest ratio of water and powder, printed on the package. I for example mix one package (125 g) with 5 Liter of water, which is the lowest ratio printed on the package. Apart from this you will come to a point where adding more powder to the mixture will result in a clumpy consistency. * Instead of wallpaper paste powder, I recommend liquid wallpaper paste. It is a liquid concentrate that has to be mixed with water, so you will not have the problem with getting the consistency too clumpy.
Adding a bit of Rends Bath Slime will then make the slime more tougher. I used 1/4 of that bottle. Try it out by just adding small amount of that stuff to the mixture until you thing that it is good enough. Use a mixer, this will make all things easier.