Hello Sandra - assuming this glass item is decorative, and isn't going to receive heavy use, then the more important aspect might be that the replacement gilding matches the colour of the original gold paint - perhaps not as easy as might be thought.
I've not the remotest idea what 'Seetuss/Seetusee' glass is - so would be interested to see this piece if that was possible. I think you can buy gilding in the form of pen/pencil application too.