One of the big problems with solvent based finishes is "drying in the can," and forming a skin on top of the finish in the can. There are commercially available products to help prevent this from happening. But ordinary propane, the stuff in your gas grill, has all the necessary properties to do this also. First, it's heavier than air, so it means it will displace the air in the open portion of the can, It's dry, containing no moisture, and it's CHEAP! To use you need a regulator and hose for gas grill. Before closing up can of finish, slowly add propane to the can above the finish, by using open end of hose attached to regulator and cylinder. Place the lid tightly on can, and next time you open can, there won't be a skim on top of finish, ruining it. Last week, I used some Rustolem that I had previously done this too. When I opened the can, there was no skin on top of the paint, as there was no oxygen in the can to start the reaction needed to set up finish. I dont reccomend trying this using your torch, as it mixes propane with air, defeating the whole purpose for doing it. Credit for this idea belongs to Tom King over at Saw Mill Creek.