[indianavette]

Has anyone had a very thin crack in their lanai floor and had it painted/stained/etc? Does it show the crack? If so, tile might be the only choice.

[gomoho]

Have several hairline cracks in my lanai and on my patio. Had them both stained/painted and no it does not hide them. You are correct tile, pavers, an area rug is probably your best bet.

[Cathy H]

Floor treatment depends on whether it is open or enclosed lanai. Paint won't heal a crack, anywhere. If lanai floor slab crack widens due to poor substate preparation, even tile over-lay may crack, so be careful.

[JohnN]

if the cracks are filled before painting/staining, you won't see them.
if they settle/crack afterward, well, they're there and you can touch 'em up but that's about the best you can do.