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I came across a guy at my model boat club who has taken the working parts of an asthma nebuliser and put it in his tug boat works a treat with glycerine, baby oil mix but i dont know the mix ratio.
Not sure if it's OK to link to another forum but thought some of you might be interested in thishttp://modeltugforum.com/index.php?topic=921.0I have no connection with the product whatsoever and I personally haven't seen the thing in the flesh but it looks very promising from the video. I believe the guy who makes them has just started up his own business after being made redundant. Hope it helps somebody