Weapon hardening

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Is it 100% success rate to harden a weapon? 

If not, does the weapon blow up in the process when you fail?

 

[Assata]

Hello,

it's not 100% if you don't have enough CON or are too low level.

And the weapon for sure blows up, and sometimes the other materials too : when the craft fails, it's blowing up the current materials and the previous materials.

Edited December 21, 2022 by Assata

[uuuuuuluuuuuuuu]

how can I tell the %? 
I statted CON but the % didn't change