Once sealed moist air will not be able to contact shed surfaces allowing it to escape instead of condensing on walls and ceilings.
Paint to stop condensation on metal roof.
The answer is a product called dr pstop which is a felt like material with a rubber backer that can be applied to the back side of metal panels that will trap the moisture as the condensation forms.
The best way to stop condensation in a metal shed is to apply closed cell polyurethane spray foam.
Anti condensation paint for metal roofs anti condensation coating for steel roofing sheets steel structures or other metal surfaces where condensation and dripping water problems occur.
The spray foam will fill every cavity and gap on your metal shed walls ceiling and under your floor.
When conditions change the ambient air temperature usually rises thereby raising the dew point.