Can You Put New Grout On Old Grout. The grout needs to mingle and set so that the surface is solid and secure from water and other potentially harmful substances eroding the material behind the tiles and grout. The new grout can be applied right over the top of the existing grout. You don't have to remove all of your old grout to apply the new grout.
If this is the case, you need to repeat the application step. You'll do far less work when you apply new grout over old grout and you will use less grout. It can also strengthen the surface to increase water resistance and make it less susceptible to impurities.
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You may have to take out the older grout layer because it is so badly damaged that it will not provide a firm foundation for the new grout layer. The new grout can be applied right over the top of the existing grout. Since the layer of new grout would be very thin and vary in thickness, it may not adhere well and the old grout could show through. With regard to filling in holes and cracks on the surfaces in our homes, we might compare grout repair to drywall repair.
