Originally Posted by KraxisSingular
No, ArP is calculated after armor debuffs. The debuffs reduce the armor, ArP as the name says penetrates armor. Different mechanics.
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To expand on this explanation slightly:
Your target has 10,000 armor.
You have 100% Armor pen, which only effectively removes ~86% of this targets armor due to level difference and mechanics implemented to prevent armor from going negative (I believe this number is accurate on level 83, please correct if not.)
Your target ends up with 2400 armor.
Sunder Armor and FF reduce 10000 armor to 7500 armor.
You have 100% armor pen (effectively ~86%)
Your target ends up with 1800 armor.
Sunder and FF affect the amount of armor you start with, but are not additive mechanics.