I had mine repaired. They opened up the crack a bit. Then put expanding foam in underneath as it was obviously felxing there. They then put fibreglass to cover the crack adn finally spary painted it a close match. It looks good.
Hi, I had a similar problem, injected foam underneath and weighted tray to stop it bulging up then used Sikaflex adhesive/sealer to cover the split, this is flexible so won't come away with use. Lasted until we sold MH.
I have seen somewhere details of a company who can sort this for you, first injecting foam underneath then spraying on a sealing layer over the shower tray. I made a note of it somewhere - if only I knew where. I'll keep looking and post again if I find it.
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