Medium Weight Iron On Fusible Interfacing for Sewing Projects, (40 Inch x 3 Yard) White Non-Woven

I want to use this fabric to line a white t-shirt that is see through and you can see my underwear. will this help?

Can this be ironed over a tear on the backside of a mattress?

Can I use this on the backside of a mexican blanket so it won't come unraveled when I cut it up for projects?

Can I use this to make a back patch from a tshirt?