This has 0.5mm = 20 mils wearlayer(veneer) thickness
Advisor is making a mistake in their answer. Underlayment is NOT used to absorb water. It's often used to BLOCK water from migrating up from the subfloor.
No, this product is not water-resistant.
No, this flooring isn't waterproof.
Yes, you need to have underlayment to go under. No glue is needed.
There is no installation instruction. You can google search Installation Instruction for Laminate Flooring online or watch YouTubue. It is a basic standard for all brands for all click-locking laminate flooring.
It is not water proof.
It is for interior so you can put it inside of your apartment. You need underlayment to go under it. 2mm thickness blue foam underlayment is the most economic choice.
Yes, this item is in internet only not in store yet. Deliver to your home or near Home Depot Store.