Rather than ripping out our engineered oak floor for a few battle scars, we decided to sand it back and varnish it. We used Ronseal Diamond Hard Satin Floor Varnish. After 3 1/2 days, my partner spilled some water on it and it went straight through in a matter of minutes, staining the oak. We tested a few more spots and the varnish is just dissolving when exposed to water. Has anyone else experienced this and is there an easier solution than sanding it all back again?