Do 30% Boss, Total Dmg and Atk Stack (post-BB) ?

Read the first part of what I posted:
two ignore 30% def on a weapon will do no better than 1 ignore 30% def is what he means

Aka, no. two of the %def ignore on a weapon will not stack.

yup, got that, i was just clarifying my question, but also, judging from this:

two ignore 30% def on a weapon will do no better than 1 ignore 30% def is what he means

If you already have a base ignore of 40% though, it'll go up to 70%(if additive) or 58% (if multiplicative) if you have it on your weapon.

i can assume it's still unknown if potential ignore is multiplicative or additive tight?
i'd love to test it, but as a DrK, either I ignore all defense, or I ignore none :S