On BAL WhiteStar, I only ever used this once and it failed completely. I had a call back on a job where the customer had decided to have a bath panel tiled replacing a plastic affair that came with the bath.
It was 15mm WBP, well made and fitted to a solid frame, so I decided I'd give the White star a try seeing as it made it clear it was for use in bathrooms and flexible enough to go on wood. Made sure the wood was clean and dust free and happily tiled.
Three months later all the tiles fell off, I had BAL technical down who took it all away and were unable to provide any satisfactory reason it should have failed, however refused any liability as if you read the product sheet that accompnies BAL white Star it's made clear that although you can tile on Wood and although you can use it in a bathroom, you can't use it on wood in a bathroom.
So I pointed out that the bathroom had yet to be used, (this was an extension in a large property that already had another 4 bathrooms). They stuck to their guns and refused any claim on the grounds that the sdhesive had been used in an unsuitable situation.
That's the one and only time I've used ready mix.