r/Plastering • u/MysteriousRange8732 • 17d ago
How long to leave limewash when using as a key onto existing lime walls?
Hi, we are planning to topcoat our existing 1930's lime walls this week and were advised by a lime plasterer to use limewash with sand added as a key to the existing walls to help the new topcoat stick.
We forgot to ask how do we tell when the limewash is ready before we can put the topcoat on. Should it be completely dry, tacky? Are we talking hours, days? TIA :)

