High Temp Sealer for cracked headers???

Has anyone tried or read anything about a Cotronics product called Resbond 907 GF for repairing cracks in the 4L exhaust header?

I found it while doing a web search.
http://www.cotronics.com/vo/cotr/newprod.htm

Let us know how it works for you.

Another alternative might be Thermosteel.

I as well as others have used it. Although my crack came back. Maybe partially since my el cheapo motor mounts are screwed again.

My buddy just did an engine swap so has an exhaust manifold left over. I figure we could weld his then put it on my XJ in the spring.

If you use the product you mentioned let us know how it works!