Longrange17
Fornby's "Tung Oil Finish" has no tung oil. It's a wipe on varnish. What you are looking for is either "Polermized Tung Oil" or "Raw Tung Oil" available through many of the better woodworking outlets. Lee Valley/Veritas, Woodcraft, and a slew of others.
Raw tung oil must be thinned with thinners to set up, left alone it will never set up. This has the advantage of staying almost forever in the container and not setting up. You cut as much as you need with thinner and use it, the rest stays liquid.
Polermized oil has driers added and it will set up in the can after being exposed to air. You have to do something to keep the can full - add marbles, or evacuate the air as the level of the oil goes down - to keep it useable.
Most of the woodworking sites on the internet can give you all the help you need to use these oils, it's not hard.
Wayne the Shrink