Started using a trap dye to protect my Mole traps several years ago.
The British made 'pressed steel' traps can suffer badly when used in acidic soils.
I have found this especialy so when working in coastal areas ,..I suppose its the salt ?
Anyway,.the 'Speed Dip' vastly increased the lifespan of my traps..
My main problem was in 'importing' cans of the stuff,..there was all sorts of problems with the Customs and Excise folk,..they frequently asked,." Is Speed Dip' flammable "?...Er,..I think so..