Lately I have been finding quite a few stick on WW's that don't melt with the rest of the WW's. If my WW's are up to temperature and the stickons are floating along with any clipon's that aren't melting they go into the pile of clips and dirt that surround my smelting set up. I don't need the aggrevation or the problems that come from zinc contamination. A few WW's lost are nothing compared to a 75 pound pot of good WW's lost because of trying to be that cheap. If it doesn't melt I toss it.
Nighthunter