Old Leafsprung Land Rovers

Apart from stripping and dipping in galvi what do you do to keep the rust bug at bay? Three years back I spent a week of evenings and two solid weekends under my truck with an angle grinder and wire wheel getting off as much scale and loose paint that I could then priming and painting, now I know I should have use some kind of rust converter but it's all needing doing again.
Whats the best solution to this? I don't really have the space to do a full stripdown and as the chassis is not to bad I want it to last as long as I do.

The  Machine Mart rust remover seems to work well, it is just phosphoric acid i think, wire wheel in grinder to remove as much as you can then slap this on to get all the pits. Then your choice of paint.

The  Machine Mart rust remover seems to work well, it is just phosphoric acid i think, wire wheel in grinder to remove as much as you can then slap this on to get all the pits. Then your choice of paint.

I went to get some of that the other day, but my local were all sold out, apparantly not had any in stock for over 3 weeks.

After finding out the key ingrediant was phosphoric acid, thought I'd just buy some of that.  Got a bottle of boingy% phosphoric acid (PH up) from local hydroponics place.

Tried it on some rust, and I can confirm it doesn't work

Got some good rust converter from local paint specialist instead.

Mark

My axles are painted with POR 15 and it seems to be holding out so far, it sticks well to every thing it gets on including you and is a bugger to clean off. I can't vouch for it being any good over rust though.

I've used both POR-15 and Epoxy Mastic 121. Trouble is, I can't remember which bits I did with which. At the end of one job I cleaned the brush with the supplied thinner then brushed it out over a couple of typically rusty brake drums. No preparation at all, just boingy% thinned paint straight onto rust. About a year later they're still looking pretty good. I reckon it was thinned enough to soak right through while thicker paint would have sat on the surface then flaked off.
Epoxy 121 is the only one that supplies a thinner along with the 2-pack cans, so it was probably that stuff... but then again I might just have used their thinner with POR-15...
Anyway, one of them's damned good!

Thanks all, this is the second time I've heard of this epoxy 121 and after reading a bit on the web I might give it a go and report back.