There is a variation of lime wash that includes a fatty oil as a sealant and has been around for 100s of years https://en.wikipedia.org/wiki/Tadelakt https://e

There is a variation of lime wash that includes a fatty oil as a sealant and has been around for 100s of years https://en.wikipedia.org/wiki/Tadelakt https://en.wikipedia.org/wiki/Tadelakt