Cheers Steve, It's just that I emailed the manufacturer in Germany because the instructions did not give any clue as to how long it lasts once mixed, and there exact words were:

You can use the mixed caliper paint for approx. 10 minutes. Please only mix
as much as you want to use for the moment. Otherwise it will be useless.

Which seems a tad confusing because the instructions say mix the hardener to the paint @ 3-1 ratio leave to stand for 5-10 Min's then mix again, so I had a vision of going back to use it and it being a hard lump in the tin

Did you have enough to paint all of your saph calipers or was it tight.