Slate Roof Central Message Board: Clean Flux off Repair?
There's nothing you can do to get flux out of the lock seam or a lap seam for that matter. Apply carefully, wipe away excess, and flush the surface when finished.
I've read about being certain to clean off flux after soldering. What is the best way to apply flux to a new or repaired flat-lock seam so remaining flux (inside the seam) is not a problem?
Also, I've been entertaining patching some nail holes that were placed in the valleys of a galvanized roof section. Can I just fill the holes with solder, or should I really use a small patch panel (i.e., 1" x 1"). What should I do to prevent flux from going through the hole?