When it comes to vinyl flooring, there are several major subgroups that are all generally referred to as vinyl. It evolved from linoleum and is typically a mixture of cork powder or other wood dust, pigments and binding agents that are pressed into sheets. They are then covered with a transparent wear-resistant layer to seal the vinyl underneath and give the tiles a finished look that varies from matte to glasslike shine. Vinyl has always been popular, because it boasts excellent qualities - it's durable and affordable, looks appealing and is fairly easy to maintain. Of course, one of the greatest things about vinyl flooring is that it comes in great deal of colors and patterns and ultimately, there is no look that cannot be mimicked by vinyl flooring.
Have you just laid new vinyl that has no sealer on it?
When choosing new vinyl, the average person would not be aware that most vinyl surfaces do require regular maintenance such as stripping and sealing. If you do not know to ask your supplier, they may not automatically tell you this information. If your new vinyl has a matte look to the surface and when wet the water seems to almost "absorb" into the floor, then there may not be any sealer on your new floor surface and you may need to contact your supplier and find out if you need to strip and seal the vinyl. If there is no coating on them you will need to have them sealed immediately in order to protect them from damage due to regular daily wear and tear.
Have you just laid new vinyl that has a small amount of sealer on it?
Your new vinyl when purchased may have a small amount of sealer on it; this is to make it look shiny and new when first laid and to also protect it from getting dirty or damaged during transit and storage. Once the vinyl is laid on your floor it will not take long, despite regular sweeping and mopping, for the shine that was on your floor to disappear. This occurs as there is normally only one or two coats of sealer on the surface which with daily foot traffic would soon be "sanded" away after a couple of months of use. In this instance your will need to have your floor either stripped and sealed immediately after laying or within a couple of weeks/months of laying, depending on the degree of use the floor gets.