Many of those products rely on heavy chemicals that off-gas nasty things. Or just smell bad. But if theyre outside then it isnt a problem.
Inside, you cant have this stuff off-gassing into enclosed spaces
Deck sealer just doesnt look as nice as other options, because indoor specific options dont have to sacrifice relevant protection or looks for the ability to deal with UV damage, huge humidity changes, and wildlife.
Its always an equation of Practicality, Personal Taste, and Material.
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