Sealer need to be applied often in your case, so just re-grout using resin grout, if I were you, I use black color. The resin grout I am talking about here is furan resin, not the cheap epoxy resin, which is commonly called epoxy grout. Get sandless version if you want smooth finish.
【在 g*****9 的大作中提到】 : Sealer need to be applied often in your case, so just re-grout using resin : grout, if I were you, I use black color. : The resin grout I am talking about here is furan resin, not the cheap epoxy : resin, which is commonly called epoxy grout. : Get sandless version if you want smooth finish.