using a spray can wont make it look natural. search some videos of model train painting, it's pretty easy. not sure if the lizard videos show you how to paint it. basically just put paint on the brush dip it in water and let is run down and it will give you the natural look like where water would have run off and stuff. also if your like me its hard to decide how you want it to look it takes that problem away since your basically letting gravity do the work