Not used Bergom but it gets high praises from those that do, it might have carnabau wax in it to seal a surface, but the problem you have is the 'dew point' in your garage which allows moisture to creep under any kind of seal, have heard of some old timers putting a 60w lightbulb in a biscuit tin under their pride and joy to keep them warm (its the cold metal that causes dew to form)-but then you run the risk of a fire -so I've not tried the lightbulb trick, just plenty or circulated air is the best you can do m8, and best of luck with your health and the re-build