I received my BLI Conductor's Club Big Boy this week. Superb model and great price. It has a smoke unit which I won't use often but will be fun for visitors. BLI included an insert which emphasized using "lightweight" smoke fluid and suggested Marklin 2421. I found it at Walthers and on-line but it is about $28 for a bottle that would last me two lifetimes. Marklin 2420 is a much smaller bottle for about $8 but I can't find any information on whether or not the smoke fluid in the bottle is the same. Has anyone tried either of these or, pehaps, a different brand of lightweight smoke fluid?
Thanks.