Oh no, you dropped a kitchen knife onto your vinyl floor cutting the vinyl leaving an unsightly scar!
To repair a vinyl floor it is very important to have a piece of flooring from the same colour dye lot. If you do not have a patch piece you may have to remove a suitable size piece from under the stove or refridgerator or from in a closet.
Remove the piece by cutting and heating with a hair dryer and scraping off. Lay the patch piece over the area to be repaired ensuring that you match the pattern. Place masking tape across the patch to make sure it doesn't move and with a sharp razor blade knife cut along the pattern on the patch through the damaged piece to the subfloor. Remove the masking tape and the patch piece. Now, you can remove the damaged piece by heating with a hair dryer and scraping with a putty knife. Scrape the subfloor underlay clean and apply a thin coat of Weldbond Adhesive allowing to dry for 30 minutes. Apply a coat of Weldbond to the back of the patch as well as the subfloor and place the patch in place pressing down firmly wiping off any excess glue with a damp paper towel. Place a piece of wax paper over the patched area and weigh down with a pile of books overnight. Next morning apply a seam weld along the pattern joint to make the repair invisible.