I'm recaulking a shower which has a plastic base that flexes a bit when stepped on in certain spots. This caused the caulking to pull away the last time I recaulked.
If this was a tub, I'd fill it with water to weigh it down while caulking/curing. But it's a shower. Any ideas on items to use to achieve the same effect? The best I've come up with so far is bags of water softener salt. I don't have a set of weight plates or anything like that.
What could I use to weigh down the shower?