Quote:
Originally Posted by arcturus
Yes Fertan say that you need to remove all the loose rust. seem to remembet that they recommended leaving on the residue, but isn't Fertan non acidic, I believe it's nicotine based.
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It has been some time since I used it in anger - I can't remember the instructions so it is best to check - but I seem to remember the usual don't let it dry out and wash off with water instruction and there's probably a warning about clean non-rusty steel too.
I'm pretty sure it isn't acid based - that seems to be a rust eating / killing ingredient