I found the Hydrate 80 worked well removing rust and leaving clean steel. After removing the cleaned parts I washed them in water and dried them immediately with a hot air gun. I did use Electrox and waited the 96 hours before applying a topcoat, but found later that the top coats were easily rubbed a=or chipped-off leaving the Electrox coating intact.
In fact, I wrote to Bilt Hamber when the problem first appeared, after I had finished painting the Deck and their reply is below. Needless to say I did not remove the lot and merely treated the affected 'spots'.
"
Electrox is and organically bound zinc rich coating that does not need to be abraded before over coating. I think the solvents at temperature with low air movement has caused this problem. Flat back and reapply, but the limit of adhesion for the new paint will be that of the flatted enamel you apply to unless you remove the lot."
