I have mine in the fridge which doubles its lifetime. One complain I have, although, is on packaging: even the small packets have too much product for small repairs, which makes the rest to be spoiled.
You should check this if you don't use a whole sachet, works pretty well.
I have a vacuum sealer and I just bought a multi color package. Gonna try it next time I use some. I'll let y'all know the results