I know that there are threads regarding the repair of cracks in shower trays, but I am planning a pre-emptive strike. There is a slight movement of the shower tray of my B544 and I believe that this could lead to cracking due to continued flexing if left untreated. Has anyone got any experience of using epoxy resin to add support to the underneath? I am thinking of drilling a series of small holes just through the tray, and then injecting the 2 part resin. I am hoping that when this has cured the small gaps between the tray and floor will be filled, stopping any further flexing. I do not want to use expanding foam, as it is difficult to judge the correct quantity, and thus cause more damage than it solves.