Trust me I am not in the construction business..and am no pro with this either....I learned quite a lot watching this old house and hometime...and did research online....ordered my stuff from a local tile shop that gave me design ideas and installation tips beyond what I already learned. The basics are really simple to learn. I have since did both bathrooms and my kitchen in ceramic tile. And still have neighbors begging my to do their house at whatever I want to charge ( I really don't have the time or motivation to do it for them). Have you determined if the stone or mortar surface you are trying to put the tile on is solid and stabile? As in not deteriorating allowing the mastic bond to come off with base material attached? If thats the case you need to address that problem first. I was of the opinion mastic is fine for a kitchen backsplash but determined on my own I didn't want to use it on the floor or batroom at all. Mostly becasue it needs to be adsolutely solid, and rigid or the grout will fracture and lay open a path to water to get behind it.
Also did you use a toothed or a flat edge trowel? a flat straight edge will put excessive adheasive compond down be it mastic or Thinset.
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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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