whilst I'm on the subject of rivets..... I spent a while on the 'queens flight' at raf benson. if my memory serves me correctly we had a couple of DH Heron a DH Devon a Wessex chopper and an HS Andover, all kept immaculate , washed and polished regularly.... well, now and again these aircraft were returned to the manufacturer (yup... we had several of them back in the day) for a major service (no expense spared for out #1 Family

), when the Wessex came back from an overhaul we were told to stop polishing it with immediate effect as the stuff we were using (wadpol) (bit like duraglit but more abrasive), had reduced the rivet heads by over 10%, and were in danger of writing off the machine completely!..... then similar problems were highlighted in the remaining fleet.....
great stuff wadpol..... used to make the rims on my goldie look better than new
and I think it's still available