Want to keep your plaster pliable a bit longer to get it all smoothed out? Just add a couple of tablespoons of white vinegar to your plaster mix. It will slow down the hardening process to give you the extra time you need.
Slow hardening of plaster

Want to keep your plaster pliable a bit longer to get it all smoothed out? Just add a couple of tablespoons of white vinegar to your plaster mix. It will slow down the hardening process to give you the extra time you need.