I just had porcelain tile installed, but the epoxy grout colour wasn’t what I chose. The grout supplier and tile installers agree and are offering to recolour the grout using, I believe an epoxy based product that they will apply with a toothbrush. My question is will this product be as durable as the original epoxy grout? Will it chip or flake. It is installed in front/back entrance and mudroom. Should I just live with the grout as is?