Quick 20 All Black Leather Repair Kit

Will it fill in little holes on black leather boots where the toes bend? Is it flexible after it dries, or will it re-crack?

Will this work to fix a leather strip connected a clasp for shoe strings that has become detached?

I have a motorcycle that has a tear on the seam, where I sit. will it hold thru off and on stress of a 200lb butt?

I have a burn smudge/partial hole, smooth black leather motorcycle seat, will this work and will the repair work be visible? Will it eventually crack?