After I bought the motorhome I took up the anti-slip mat that was in the shower tray as it was pretty ugly and underneath I could see that there were quite a lot of hairline tracks in the tray which not only looked pretty bad, but it’s possible that some water could leak through there which is never a good thing!
I did some online research and found quite a lot of options. There were various fillers which seemed to be designed for a more major crack where the tray was seriously damaged.
The cracks I had were very hairline and seemed mainly cosmetic, so instead I just opted for some simple shower tray paint. It just looked like regular gloss paint to me but it wasn’t expensive so it was fine.
Here’s a video of the job: