Start with masking the joint with a suitable masking tape to protect the precious sandstone.
Fill the hollow space of the joint with a correctly sized backup foam rod OTTOCORD PE-B2.
Remove any loose dirt from the joint with a brush to ensure a flawless adhesion of the sealant.
Apply OTTO-Primer 1102 to the edges of the joint with a cloth.
Now apply the natural stone compatible silicone OTTOSEAL® S 70 evenly to the joint.
To smooth the joint start with filling the OTTO Marble smoothing agent in a suitable container, then moisten the Fugenfux and pull off the excess sealant with it.
Now you only have to remove the masking tape and clean the area around your joint.