this is probably common knowledge to some people but i would pass this
when you caulk/silicone/whatever a new tub, or recaulk an old one, fill it
with water first for the weight. when the caulk dries and the tub drains it
will raise up and compress the caulk leaving it intact. when its full again
its simply in the relaxed position.
if you dont do this, when you fill the tub it will sink down a bit and it
can pull the caulk away. stuff holds up better under compression than from
hope this helps someone.