One of the main reasons I bought my Diversion was to repair a drysump oil pan damaged in a recent blow-up. As I expected the cracks are seeping synthetic oil everytime heat is applied. I heated the ally last night with a soot guide coat so as to hammer it relatively flat again and hoped it would burn off some contamination.

Also been spraying electrical contact cleaner into the cracks. Still I'm getting instant black grainy welds. Oh- I did discover why big pieces need preheat;-))

Any tricks for cleaning cracks available?