Rust converter products

[eng622]

Having removed as much loose rust and flaking paint as possible from the chassis I intend to use one of these milky/grey liqiuds that turn blue/black. Problem is there are so many on the market and not all are good from what I have read. Ruling out any with phosphoric acid, the need for the surface to be dampened or wiping off powder when dry (Fertan). Not sure about Ferrozinc either as most zinc products need good clean steel.
I'm looking at these, any comments?
Vactan - vinyl acrylic co-polymer containing tannic acid, found on ebay
Neutra Rust 661 - an older product, much copied but still highly rated
Granville heavy duty - better adhesion if surface dampened, from Frost's
Wurth- have used this, a body shop gave me some, but cannot find a source

[eng622]

Had a look on google for Rustroy and according to the Wymark website it can be used to prime over clean steel and paint as well as rusted steel, so sounds an ideal base primer for the Griff chassis. Not sure where you can get it from so emailed them. Jonjo, did you paint over the product on yout TR6? I'm always worried with these types of products as you never know whether they are going to flake off or the finish burst due to further rusting under the coating, but yours seems to have stood the test of time.

[eng622]

Just had a reply about Rustroy, it's only available in 5L cans, recon that's enough to do about 10/20 Griff's chassis/suspension. It's £55 delivered, not expensive for the amount, I guess