Product with Polymer composition should be used for tiling onto non-porous and glossy substrates. Efficiency ways for tiling onto these substrates are either;
1. Use ready-to-use paste adhesive, which is specially formulated for internal wall tiling onto existing tiles with no primer required.
2. Apply primer that composes of polymer to increase bonding property, and then tiling with high performance cementitious adhesive
Check the existing tiles and make good
It is recommended to always check bonding between old tiles and substrates in order to prevent the debonding of existing tiles from the strength of adhesive after tiling over. One more things that should be considered is to fix new tiles over the joints of existing tiles to provide interlocking system.
Working conditions and individual requirement are main consideration factors for choosing the products for fixing tile onto existing tile.
1. Substrate preparation
Wipe off any stains on the existing tiles.
Remove any unsound tiles and re-tiling.
Clean off the existing tiles until free of grease or any oily stains and allow drying.
3. Leave the adhesive areas dry
Leave the adhesive areas for at least 24 hours before grouting.
4. Grouting with anti-fungus and stain-resistant grout; webercolor power
Leave the grouted areas for at least 24 hours before using.