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Sealing Boiler Flue Collector

ice4me Member Posts: 21
I just picked up a used Weil McLain CGa-4 boiler to temporarily replace my current boiler that has a leaky heat exchanger. While going through it for cleaning and inspection I noticed the sealant around the base of the heat exchanger and the flue collector is all falling off. Any recommendations for a new sealant?

I was thinking of using this: https://www.plumbingsupplynow.com/high-temp-red-silicone-caulk-25666

A few pictures of the boiler: