Due to water damage under the kitchen sink, I scraped off swollen and moldy wood. It seems like a thin vineer over OSB. I don’t plan to scrape off all of it as it is tough and if unnecessary. I plan to cover the whole floor with a water proof material, preferably in a single sheet and flexible enough to be manoeuvered around in this space. Can you think of such a material that can match wood color pattern if possible?

Thanks