Radiator leak sealer barrs etc. damage.

I just happen to work at a "auto parts" store which I will not name. A lot of the customers buy the "Bars" stop leak and ask how it works and I tell them its made to stop a leak and that's about as far as I get into it with them. I tell them the best solution is to just fix the problem correctly, (replace whatever is leaking). I have had a friend use it and it created a sludge in the radiator. From the looks of what you have there I would guess that multiple stop leaks were used in system. Just my .02

Aj