It is absolutely fine to leave it for longer. The important thing is to wait until the first coat is fully dry.
The odour of the filler may have various origins such as the nature of the surface you are covering, the thickness applied, the temperature, humidity and ventilation of the room, etc. The odour will disappear once the filler is totally dry, usually in a day or two but this may take longer depending on the factors described above. To speed up the drying process we recommend warming up the room and allowing a good air circulation. Once dry and the wall is painted, any residual odour will disappear completely.
Yes, Magic’ Tile Covering It can be wallpapered, but if it is being used in a damp room such as a kitchen or bathroom, we recommend that any wall covering, whether wallpaper or paint, should be damp resistant to prevent peeling.
We distribute via Relay global in Ireland. You can find stockists on their website.