No other sealant is required for the black waterfall foam. People use it in aquaria with no additional sealant.

And yes, you can wash plants and then use them in cages. I usually remove them from the dirt and wash roots and all and then repot in fresh soil.
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Currently keeping:

6.10 Gonyosoma oxycephalum (Javan, mixed colors)

0.0.4 Rhynchophis boulengeri

1.1 Philodryas baroni

1.1 Lampropeltis triangulum multistriata

0.0.1 Rhamphiophis rubropunctatus

0.0.2 Morelia viridis (Aru & Merauke locale types)

1.0 Rhodesian Ridgeback

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