I apologize if this has been asked before, I searched but have been search challenged in the past.

I am wondering if Renew and Shadow Word: Pain stack if you have multiple priests?

I am toying with 4 Priest and 1 Warrior. I already have 70 priest and 70 warrior so was just looking to power level 3 more priests. Can't find too much on this combination other than multiple mobs pulls could be busy with aggro. I got to think though if renew stacks and sw:d stacks that has to be powerful combination.

Should have specified not really looking to concentrate too heavily on arena just play in bg's and play around in regular level instances to see them.

Thoughts?