I can highly recommend MS Gunge from messysupplies.com slightly cheaper than natrosol, but it mixes in a fraction of the time and ready to use in a few minutes... Feels a bit thicker by comparison too! Pop in for a try :-p
I agree wholeheartedly with gungemastermk. MS Gunge from messy supplies is brilliant. Mixes really well, looks and feels similar to natrosol, and is great fun. Its also slightly cheaper. It also doesn't smell unlike food gunge, which is a good and bad thing depending on your preferences I guess. Personally the smell can of savoury stuff such as beans puts me off. I tried getting myself messy many years ago with some, and some cream and the smell hung around for days. I then didn't do anything for about 7 or 8 years.
Also its really easy to clean up and doesn't stain in my experience.
yeah i agree MS Gunge is great, love their products and yes @gungemaster2003 i agree "It does feel slightly thicker and sloppier which is obviously great.