Dismantling Garage(Deck) panel

[Robin_]

Hello everyone,
To give it a proper clean I'm trying to dismantle my garage panel.
After having removed all screws and the traveler, the panel is still unmovable.
Does anyone know if its held from the inside as well perhaps?

Regards,
Robin (Bav. 39 Cruiser)

[Lazy Pelican]

It sealed possibly with double sided tape or otherwise mastic.

[Robin_]

Indeed it was sealed with some silicone. Gladly a Winbag lift bag underneath and some air pressure loosened the grip of the silicone.