I'm using the homemade two part + mag method. My question is does either the Dow Flake or the Mag expire in its power form (premix) and/or liquid form (post mix)?
Randy Holmes-Farley
03/14/2012, 07:44 AM
No, they never expire.
The solids can become rock hard as moisture gets in, dissolves, some, and it rehardens, but as long as you can chip it out, it is fine to use. :)