I put two coats of paint on my wood flooring as the observatory is off the ground. It’s was also to protect the flooring while the build was underway in case it rain.
Home Depot, I got ocean blue indoor/outdoor carpet. It is really cheap cost wise ($2 foot) but really nice and thick close loop pile. I just stapled it down every two to three feet. It’s work really well and still looks new a year later. Dew will happen even in the Texas Hill country and having an ‘outdoor’ carpet is a requirement. It is thick enough that a few drop items does not get damage, yeah, not that I drop stuff, yeah. Bad back so it is soft to stand on. Cleans up quick with a vacuum. Nice to lay down too and look up at the stars. Shoes off (myself and visitors) if the shoes are dirty as I keep my floor clean. Although I did just make a 250 foot raised (2” base and 2” of small granite on top) six foot wide pathway to the observatory, just to keep access when or if it ever rains again.
I figure in 8-10 years I can pull it up and put the same stuff down and it will look new again.