OK, then I am wrong. You must be doing something right That others have not. I have seen many block repairs that have not held very long. I would not weld
blocks because it just is not worth it for someone to put all the work into the engine then have it leak again where it is welded. It may work 9 times out of 10 but one customer with a failure would cost me much more than I would make on welding blocks. I guess if it was mine I might try it, depending on how much work it would be if it did happen to fail.
I have never heard of cronatron before. I just went to there web site. Wow are the expensive. I thought Eutectic was expensive . 50 lbs of E7018 for over $300. Your cast tig rod is over $350 for 2 lbs. I find it hard to believe they have something worth that kind of expense that can not be purchased from someone else for less. I would say they just repackage and resell and not make any of there own products.