How to remove old JB Weld using torch J-B Weld removal

I got a batch of old RC parts and one of the exhaust pipe was repaired with JB Weld. I wanted to remove the old stuff and weld it the correct way with aluminum brazing rods. There is only two ways to removal old J-B weld. One is to sand/grind and the other is heat. SB weld burns at 600 degrees.

Aluminum Brazing Rods
https://www.amazon.com/gp/product/B01MCTUIUN/ref=as_li_tl?ie=UTF8&tag=fintechcomm0f-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B01MCTUIUN&linkId=23aa2f788582d9bcf94f721e7ce514ed

Propane Torch
https://www.amazon.com/gp/product/B004FPZACE/ref=as_li_tl?ie=UTF8&tag=fintechcomm0f-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B004FPZACE&linkId=7421cdc02e285820371d9af5c80c6f01

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