Though laminate flooring is among the floors that are considered to be water-resistant, it shouldn’t be installed in a high-moisture area. In case of water exposure, the floor soaks up the water and swell, under high temperature the board with a thickness of 5/16 inch may increase to 7/16 inch or more.
Laminate boards can get wet with the top part only, and should be moped as soon as possible in order to prevent the water from reaching the edges or seams. In case the water has already reached the edges, it can be extracted through a wet-dry vacuum.
If the floorboards are damaged from water, the only solution is to change them, for the laminate is made from recycled wood and wood fibers. There is no option of refinishing.
In order to make the laminate floor waterproof, one can apply hydro-seal on the surface and side groves of the floor. This will allow the laminate flooring to remain waterproof for up to a decade.
Another way to avoid the water to penetrate the edges of the laminate flooring is to block the contraction and expansion gaps. Silicone can be used as a material to caulk the gaps. Since the expansion gaps are most likely to get water-damaged, it is absolutely essential to take care of them while making the laminate floor waterproof.
One more option to make the laminate flooring more water-resistant is to coat it with polyurethane. It can protect the entire floor from any kind of moisture damage. The polyurethane can be applied with a mop and afterwards it should be left to dry out. The coating can be repeated several times depending on the laminate quality.