Seems lika a good idea.Aluminum tape can be your answer.
All unopened tins I tape with it and they are fresh even many years later when opened.
For opened tins I do not want to put in mason jar aluminum tape keep them reasonably fresh for up a couple of years, they dry out a little bit over time which is not necessary bad as they become close to perfect drying conditions particularly for wet blends. But if you want to age them put in mason jar as already said.
However currently most of my blends are bulk (mainly G&H) and I keep the bulk in mylar bag storing the one I need for 1 year or so in Mason jars.
I like my tins clean; does the tape come of easily ?




