Lucky you're not a painter then! :eek:
There appears to be major outgassing evident by the bubbles and air pockets. This is a reaction between the first coat and the binding agents in the tile. This will continue to occur in multiple coat systems as it a continuous contamination throughout...
Totally agree with these 2 statements.
Colours can't be relied on from those small swatches. Over a vast, flat surface, and the inclusion of sunlight, that colour will naturally be lighter.
You need to pay the tradesmen for his work.
pinkboy