The paint was so thick a mixing stick I left in the paint stayed upright whilst I got out the dust sheets & ladders etc. It was described as mono couche & for once it actually was. It covered well although it was hard work to roll on.
Tollens guarantee it for 12 years as long as you comply with their long list of instructions so I guess the answer is 'maybe' as I must have failed to apply it as they say.
Thing is, my missus changes her mind about the colour every few years so longevity is not that important.