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Are you able to seal around the outside edge on the Ob to the concrete ?
I used a Bitumastic based sealer (lasts heaps longer than silicon outside) on a glass house sun room attached to a house. The stuff was water based and just painted on as a thickish paste then the surface dried to a film but it stayed flexible and as far as I know is still there after 10 years plus.
Paving paint for inside after that. Oil based so it resists better but needs to be dry surface.
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