I purchased another can of pressure pack primer to complete the interior of the seats then clecoed them ready for riveting. I have bad news re my air compressor, it has a burned out motor & would cost 60% of a new compressor to repair. I might try to find cheaper replacement parts in the future but for now I'll buy a new one. Unfortunately the closest retailers of compressors are in areas of COVID-19 lockdown so tomorrow I will travel to Canberra, a 2 hour drive each way, to choose a replacement.