I have been using a bulk tank of Mapp gas for three years and now my gas supplier has stop carrying Mapp and bought me Chemtane instead. Has anyone successfully used Chemtane? I find the beads have a yellowy tint and the 7.5 lb tank cools alot faster than the 7.5 lb tank of Mapp gas. Would I be better off trying propane? I would appreciate any help making the change. Lori