Been tiling the bathroom with large (450 x 300mm) porcelain tiles. Much of it was tiled before so removing the old didn't leave a perfect surface. However...
Did the one wall which is old (100 years) plaster on brick. Some of the skim came off which I made good before tiling. Fine. Looks great. Moved on to another which is plasterboard and skimmed and in excellent condition - this one was wallpapered. Did about half and ran out of adhesive. Which was Homebase 'waterproof' adhesive and grout. Bought at the same time as the tiles.
Now my closest shed is Wicks and they are rather cheaper than Homebase so bought some from them. And this morning while finishing off that wall all the tiles fixed with this stuff yesterday fell off. Quite a shock when the first one went. The adhesive remained stuck to the tiles and you could see it had been flattened where it contacted the wall but had come off clean as a whistle from the plaster. The ones stuck with the Homebase stuff are absolutely solid on the same wall.
I'm obviously going to get the Homebase stuff again - but what's wrong with the Wicks product? Stored past its best or just no good? And do I just take it back and complain?
Luckily not one tile was damaged by falling 6 ft or so.