I had an old can of poly in the basement, and decided to give it a try. Thin crust on top, poured kind of like egg whites. But after mixing with mineral spirits it seemed smooth, and the result on my new plywood workbench top is smooth and fully cured as far as I can tell.
But why?
Saves a trip to the store, and the cost of a more expensive (because inflation) new can.
Why not?