Stripped Trans Drain Plug

Stupid question... if using the form in place gasket, why are surface imperfections (within reason) undesirable if the gasket maker should conform to whatever the mating surfaces are?
 
I ended up buying a used trans pan for cheaper than it cost for a tap, drill bit, and oversize plug. Plus I feel a lot better knowing I have a stock plug which I dont need to modify.
 
Stripped bolt fixed!

I had this problem today. The bolt was stripped but I figured the female threads on the pan were okay. The hard part was getting all the metal from the bolt out of the female threads. I tried a few things, including. a dental pick but the metal was too tough. I started thinking I needed to replace the whole pan. But I went to my auto parts store and bought an M10x1.5 tap (not the full helical set, but just the tap) and ran it slowly and carefully through the female threads. After that, the new bolt threaded on very easily. Then I ran a few quarts of transmission fluid through the system to flush out any metal shavings. With new crush washer installed, I was able to torque it to 15ft/lbs (actually used an inch pound torque wrench at 175in/lbs, which is just a tad under 15ft/lbs; a full 15ft/lbs is 180in/lbs. Anyway, the solution works perfectly and only cost $10.
 

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