I've never used sealer Deb. I've never felt the need personally and the pots breath well that way. I've never had problems at all with the pots either, whether completely natural and mosses forming on them after time, or stained/painted with latex on the damp pots, which as they dry together does create somewhat of a seal. These are just my ways of doing it. I think we all find what works for us in our own minds, and many others will have views to share to. My technique does work however!
