cracking ABS bathroom walls and end caps
The abs plastic degrades with age and gets brittle and shrinks a little. That leads to cracks opening up. You can sometimes stop the progression of the crack by drilling a hole in the end of it. There is very little you can do to restore the properties. If the curvature is not too tight you might be able to cover the defects with vinyl bathroom wall "paper". Some brands have a little stretch and work better than others. I have also seen vinyl with pressure sensitive adhesive cover the problem.