It didn't go so well. Tried preheating more each time and got to the point the iron was turning red - still the SilBr still wouldn't lay down. I could put some nice beads down a test piece of iron so it wasn't the idiot behind the gun. There was something in the block iron that the Silicone Bronze hated. The frustrating thing is that every time I ground a failed bead out the groove got bigger. I finally gave up on the SilBr and grabbed some Lincoln Ferroweld. Started laying some decent beads but the stuff cracked like crazy. I'd put a 1" stitch down and the opposite side would crack. In disgust I grabbed some nickle rods and started to lay some really nice beads. Of course, in my frustration I didn't bother to grind out the ferroweld which continued to crack. In the end, it wasn't pretty, but I did get the block to hold water which was my original goal. Of course the grooves are so large that I'll never fill them with bead so I stopped at water tight and just filled them with bondo. Nothing that I'm proud of but I think I can get the repair to blend in so it doesn't look like the cluster F# that it turned into. Ultimately, I spent too much time trying a new process and I should have just stuck with what has worked for me in the past: Nickle.