04-09-2010, 10:07 AM
Before you give up on soldering the frog, try Stay-Brite silver bearing solder use Stay Clean flux with it. It is a soft solder with a little silver in the alloy, and I have found that it solders to a lot of materials that 50/50, 40/60, and 95/5 won't work with. It is probably a bit more expensive than the more common solders, and as far as I know, you won't find it at any big box home center. You probably need to get it at a welding supply store. The flux is a liquid about the consistency of water, so use a cheap paint brush to apply it. I used it in refrigeration work with copper pipes and user an acid brush to apply the flux, but for modeling, the acid brush would be too big. I would try the cheapest water color brushes you can get. The kind that wold come in a child's water color set.