How to tile over tile.

https://www.ceresit.com
How to tile on tile.
Products used:
CT 19 Contact primer “Supercontact”

https://www.ceresit.com/en/products/interior-finishes/universal-primers/ct-19-contact-primer-supercontact.html

CM 29 “Multi Xpress”

https://www.ceresit.com/en/products/tiling/tile-adhesives/cm-29-multi-xpress.html

CM 15 “Marble” tile adhesive

https://www.ceresit.com/en/products/tiling/tile-adhesives/cm-15-marble-tile-adhesive.html

CE 40 “Aquastatic” Flexible grout

https://www.ceresit.com/en/products/tiling/grouts-and-sealants/ce-40-aquastatic-flexible-grout.html

CS 25 “Sanitary” silicone

https://www.ceresit.com/en/products/tiling/grouts-and-sealants/cs-25-sanitary-silicone.html

CT 10 Balcony impregnation agent

https://www.ceresit.com/en/products/waterproofing/facades-walls/silicone-based-products/ct-10-balcony-impregnation-agent.html