I was informed by my supplier in the UK that you can paint etching primer or zinc paint directly on top of your rust dissolver. Is it not necessary to wash this of with water first or is it ok? The reason is that I am doing the sills in a 65 porsche an I am unable to wash out everything. Would it be wise to use a rust convertor afterwards for areas that may not have removed all the rust completely?
Also the rust convertor goes brown after it has removed the rust and dries, is this ok, as I have wiped it away and the metal does seem ok. The brown coating does make me uneasy for obvious reasons.
I await your response with urgency as I will continue working on this in the morning.