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

Good show, Rich!  I've used JB Weld (24-hour kind) to seal several
burner cans with reliable results.  All of the leaky seams were pretty
small/thin so that might have helped.  Also, as previously mentioned,
diluting the alcohol (only grain alcohol, please - the cleanest burning
type) will slow down the likelihood of any aberrant flames. 

Good Luck,
Wayne