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I got it from a company called G-George resides in one of the toolboxes on my working table.
How to use;
1) heat press or form a thin PET plastic sheet on the original mold or model.
2) draw rivet lines on the original model
3) apply a very thin coat of plastic primer mixed with grey lacquer
4) put the formed sheet onto the model
5) trace the rivet lines on the sheet with a pencil
6) use the rivet tool from the backside of the sheet
Benefit of using this tool on PET plastic sheet is that you can also reprodute wavinesses of the aircraft's skin.