Between my tub and tub insert there is a gap that goes from 1/4 inch to an inch or more. Yes that big of a gap. I have recaulked the tub many times but the caulk seems to just melt away. I do fill the whole space with caulk but it never seems to set up correctly. Should I just to little beads at a time or is there something else I can do to fix this. Yes I know I need a new tub but with my money situation it will be a few years before that happens.