Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

If it is rusted badly, you can use KBS gas tank sealer but the pre-cleaning solution will work a number on the finish.  But both Weeden's that I have had to do that too did in fact work.  Though the 1st one was more of a experiment on a older Big Giant with a steel/tin tank.  The other was a Weeden #20 that its tank was brass but the center flute was steel/tin - that one you could hardly tell I used the KBS tank sealer - which it ended up being a birthday gift to my brother.

The KBS sealer isn't cheap and you'll end up wasting 95% of it - once you open the can you use it or lose it.  So there is the whole ROI when you buy that stuff.

Good luck, hope we see a video of it running!