Silver Back Foil Problems
I have a terrible time getting silver backed foil to stick. I clean all of my pieces with alcohol before I foil, I burnish and check for bad places and burnish them again if needed and still I get parts of the foil that won't stick after I solder.
I don't have a problem with black backed or copper foil only the silver backed.
Thank you for all the wonderful information you have shared. Especially the water prism tutorial.
First off, I have some questions:
1. Was it a new roll of foil or one that has been opened for a while?
2. Has the foil been stored in a very warm place?
Old foil that has been left opened will occasionally lose it's adhesive power. Foil that has been stored in extreme heat can do the same. If that's the case, get a new roll of foil. If neither of those are your situation read on.
Sometimes you will get a roll of foil that just doesn't want to cooperate. It sounds like you're doing all of the right things to maximize sticking, and I can't think of anything else you could do, that you haven't already done, to make it stick.
I'd suggest trying a different roll of foil, or a different brand. If you're using Venture foil try Edco instead. Take the bad roll back to where you purchased it and tell them what's happening. They should give you another roll, although I'd watch getting a roll from the same batch, as the same problem might possibly occur.
I'm sorry that I can't come up with a magic cure, but I do hope that what I've said makes sense and will help you.