A thinner for lime paint:  When you mix lime paint with latex/acrylic paint, it will thicken quickly.  Instead of adding water, add a little vinegar.  It will bring down the ph level by adding acid, thus reverting the mixture to a liquid.

Jobsite safety:  If you get lime in your eye or you find your hands itching or hurting from handling lime, use white vinegar to relieve the pain.  FOR EYES, water down the vinegar, substantially.