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When I've used solder to fill things* I've found you need to get it hot and then over fill and file back. Idk if that's viable for something nice and polished.
Also just thought that I use wire with flux combined. Check if yours has flux, if not you might need to add some to the surface first.
*small things
hugo7
@andos
Anyone got any ideas on how to seal tiny pin holes in a radiator? Its polished steel and the solder I have tried to use just drops off.