Uh-oh! Most of the way through our hardibacker install over plywood we realized we'd been using tile adhesive (Tec brand ready-to-use universal tile adhesive) instead of the recommended thinset mortar. Should we pull it up and start over (big mess, big expense but will do if future tile failure is probable)?
Never use premixed mortars. Especially to lay the tile. Use a latex motified mortar. As far as what you already have done......it will be fine. Use cement board screws and tape and mud seams with thinset.