Used this stuff to prime to tile over my existing backsplash and tile over existing bathroom tile. Everything held up for the couple of years I stayed in that place after.
The last bathroom I tiled over tile, I just scrubbed the tile well then tiled over. It is in one of my rental units. It has held up all well for nearly 6 years so far. Not necessarily recommending just giving that experience. Cost was a issue.
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Still_Willow2252 t1_j9c2e5e wrote
https://youtu.be/XRRYDEa-pDM
This channel on YouTube has alot of videos on home improvement and actually covered this exact subject. Think he has a newer video on it as well.