'real' viscosity would be a nightmare to implement, it might be possible to make something surface-tension-esque tho. dunno, go suggest it to cracker :P
1. think about COANDA effect, at least to air, too. 2. the viscous fluid will be more viscous when cooled and high pressure, and less viscous when heated and low pressure..
Make a pile of broken coal, add a little oil on the top, light the oil and you got simili-napalm Actually if we would just copy the broken coal, change the colour, and rename it napalm nobody would see the difference lol