Ok thanks - I’ve got some marine epoxy which I think you can varnish over so will be using that. I will try to open the cracks a bit and maybe use a syringe or something to get the epoxy in as deep as possible!
With the window repair stuff it's recommended to use a die grinder with a 3mm bit to open up joints and fill them. Different applications though so not sure how transferable the methods are!
Ok thanks - I’ve got some marine epoxy which I think you can varnish over so will be using that. I will try to open the cracks a bit and maybe use a syringe or something to get the epoxy in as deep as possible!