What to use to reseal laminate floors?

Laminate floors are made with a plastic or polymer based material. If you speak of the finish of the laminate itself, it cannot be resealed. The surface itself is nonporous, making it impossible to create a new bond that will give you an ascetically pleasing appearance.

If you are speaking of resealing the perimeter of the flooring, you only need to buy a tool meant to pull caulk out and reapply new.