Hi, I've recently started repointing a bluestone wall. I've not done it before, but did my research used a mix of 1brighton lite, 2 lime and 9 yellow plastering sand. I made a fairly dry mix using a little bit of oxide pre mixed in the water. About a month after completing the work in the photo it rained heavily - the wall is exposed to wind and rain. It has also been pretty cold (Adelaide weather). What was a nice earthy yellow has become a darker colour in patches as though...

More...