WHM questions please help~

[Kraftstyle]

So I have two questions.

1. Should I constantly be casting stoneskin? A tank I played with said I should use it often on everyone. But it kills my mana during boss fights! I usually prefer to use it on myself or if someone is about to take a big hit ( if I can cast it in time...) To give some background of where I was asked to do this was during Wanderers Palace... But the runs I performed before went smooth without spamming it..

2. Should I take time for a bit and work on getting an eye for an eye?

1. As it was said before, Stoneskin is more a situationall skill, not a spam-skill. Don't let some random tank mess with you)
2. Why not? It's not too great, but can make a situation less stressful in a crucial moment.