"js.b1" gurgled happily, sounding much like they were
saying:

Zinga (think that is right) is an improvement on Galvafroid

I asked more-or-less the OP's exact question of a supplier of both Zinga
& Galvafroid. Their answer as to which was best?

In the context of used car suspension parts, cleaned up with power wire
brush, they said... neither. Both of those require REALLY clean - freshly
blasted - steel to give of their best. For this job, they recommended
Rustoleum 769 primer.