My st24 has a full stainless but only has mild condensation. The stop smoke products will only mask a problem.

Best thing you can spend on it is to get it to a garage for them to sniff test it at least. If its the headgasket as i described earlier it will be worse until the thermostat opens as the water will only be in the engine and not round the rest of the system.
I wouldn't keep running it though until you can rule out or confirm its the headgasket.

Theres still all the basic signs to look for, water loss, mayonnaise in the breather cap etc..