Hairline Cracks In Shower Tray

[colin H]

Hello Folks ,
I have an acrylic/stone resin shower tray which is four years old . Ive noticed several hairline cracks appearing in the internal corners of the surface . Theyre barely noticable at the moment , but Im sure they`ll get worse .

To remove the tray would be a major task , which I dont want to do at the moment . Is there a kit which would be reccommended for such a task .
Also , is this a repair which could be done professionally .

 

[colin H]

after some research , I believe the surface is delaminating - due to a manufacturing fault . Would I have any comeback against the seller , and is there a possible fix ?