4000UV will stay white better than 4200, plus it pulls and cleans up better.
Whatever you do don't use 5200!!!
For my floor panels I plan to use a compressible foam strip on the flange that the panel will sit on. I'll screw the panel down on top of the foam strip, and then fill the gap on the edge with 4000UV to seal it. That way, when I need to pull it up, its just the seal that needs to be scraped out, and the hatch will not be adhered to the flange on the bottom. Gluing it in on the bottom is asking for damage if you have to remove it at a later date.
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