I know your ment to fill the bath with water before siliconing I'm in a situation were I can fill with water. Can you put something heaving in the bath to have the same effect as water?
Will not exert the same forces on the sides and over the base that causes the bath to flex but I never bothered anyway and no issues as long as your bath has a wood support under the rims
Odd that you would be at the stage of siliconijg a bathroom that has no water connection; wait until it does?
If the building has any functioning tap to which you can connect a hose pipe, put the plug in the bath, use the hosepipe to fill the bath, leave the hosepipe in the bath, silicone, let set then (if the bath isn't connected to a drain either) simply disconnect the hosepipe from the tap end and lay it down somewhere where it is lower than the height of the water in the bath (eg if the bath is upstairs and the hosepipe tap is downstairs jutting out the pipe down on the floor). As the hose is full of water, a siphon will start that empties the bath
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