I’ve had great luck gluing the gaskets to the pan, where it’s easier to remove them from later, and not glue to the block. Haven’t been concerned about reusing oil pan gaskets.
On y’alls advice I’ll try fixing them to the block next time, that sounds reasonable too.

Valve cover gaskets I do like I glue to the cover, and nothing but oil on the other side.
Then it’s reuseable for years.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-