Another solution is to keep a supply of glass marbles on hand. Add a few every time you use some varnish to keep the liquid level near the top of the can. Haven't tried it myself. Tom

: I've had a quarter can of Z-Spar Captain's and a quarter can of Z-Spar
: Flagship varnish turn to jello right in the can almost overnignt. Once it
: starts it seems impossible to stop by thinning. I always keep the lid on
: except when pouring from the can. I thin 10 to 20 percent in the can with
: Z-Spar T-10 to apply here in sunny So. Cal. I've even tryed to float
: thinner on top before capping. I hate thowing away $5 worth of varnish
: from every can. Any solutions? Should I transfer to smaller containers?