Roux233 Anti-Aging Extra Repair, Leave In Treatment with Strengthening Keratin, 3 Applications per Box

Do you apply this after washing your hair? If so, do you use other styling products after applying this?

Some of the products are called "roux leave in treatment" and others are called "roux fermodyl" what is the difference?

How do you open? I love the product but have to get the saw from the garage to open.

Is this product for treated hair?