No welds breaking here. Here is my setup. I first spray the headers with some sort of heat paint. I want to cover bare metal because of the gap between the wrap and metal = Condensation.
I now want to wrap my winds so I look all roof tiles, or the shingles [are wrapped] so when you see the correct wind it looks like the rain will wash over a wrap, not sink into the wrap. Otherwise water will settle in the lowest spot. There might be your crack = Rust.