Mine looks similar but it is not real wood. It is some sort of faux wood. If yours is real wood, you should be able to sand it, then bleach the wood with muriatic acid or oxalic acid, then stain and varnish. If you go to all of the trouble to remove it, I'd put some sort of faux product down that is water resistant and anti-skid. There are many faux wood products, just be sure it is rated for outdoor (and/or wet) environments.
In the past few months I have surfaced two concrete floors with Rustoleum’s epoxy garage floor surface paint. It is marvelous stuff. I can’t say enough good things about how the job turned out and how easy it was. A gallon would be WAY more than you need so you could easily test it out on a piece of fiberglass. The can says it will work on fiberglass but I have no first hand experience there. You can add anti-skid beads and a high gloss surface if you want. This is a picture of the gray floor I did. This is a utility room at work. I also did a floor in blue. You can get many different colors. The floor in my picture does not have the high gloss or anti-skid. My understanding is the anti-skid is only necessary if you go with the high gloss.
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Here is a color that would look nice as a faux wood floor... kind of looks like cherry.
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I think this would also look very cool...
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