thanks for bravely providing your SCOTT to test the Coleman´s mustard recipe. After enjoying your pictures i will return the mustard can back into the kitchen…
I repaired some kart and bike pressurized radiators with modern aluminium cores by applying drops of 2-component glue (for example UHU-brand) and it worked. This stuff smells like epoxy, hardens within an hour and is glassclear. I tried it sucessfully on leaking glassfibre petrol tank too. A clean and dry surface around the leak and generously spraying with brake cleaner for degreasing is recommended
Our local radiator repair shop advised me to try this method but i don´t know whether it works on brass honeycomb radiators.