Ok, so I had a look under my 4wds underbody the other day and it's got loads of rust spots starting. I've been googling loads about rust prevention and it seems my Trufield electronic rust prevention and regular washing isn't good enough for driving on the beach most weekends

I bought some Heavy Duty Lanolin and tested it on small section, it just attracts sand and dirt like a magnet, from reading forums it seems this isn't the best solution.

So far it seems Chemtech Fertan rust converter is a good start for treating my existing rust.

Then to stop it happening again there are two seemingly durable products coming out top.
1 - Penetrol (Paint Conditioner and Penetrol Aluminium), seems you paint/spray the conditioner first then the aluminium when that has dried.
or
2 - POR 15 (marine Clean, Metal Ready & POR-15)

Has anyone had any experience with these products and regular beach driving? How do you apply them without pulling your 4wd to pieces? Can this be done professionally?

Cheers
Dazza

Get some Sacrificial Anodes

I've heard some electronic rust preventions guarantee against rust, if they find it they fix it.
Perhaps this just applies to new cars

2 cans of cheap matt black spray.



Spend 10 minutes and spray under the car on your chassis every 3 months.

That will slow the rust down, doesn't stay sticky for 2 months and collect sand and grime, and the car looks tidier underneath for a short while.

Some scoff at this idea and insist on only hand painting on heavy duty thick chassis paint. It my experience these same people generally never actually get around to doing the job 'properly' and the car gathers rust anyway.

Bottom line: 8 coats of quickly applied normal paint over 2 years is 100 times better than none.

Go the fish oil spray on with a cheapo weed sprayer maybe

i tried spraying rust cure but it does not last long - looks real good for a short while tho!, i reckon spraying the underneath of the car with the old engine oil would be messy but work well cos there is no rust around where my engine is leaking oil!

spray the lanolin on and drive on a dirt road (away from the beach) its this build up of dust and lanolin that keeps the salt and moisture out.

Coupler Tech Electronis Rust Prevention

couplertec.com.au/

I have this fitted to my 4x4 and no rust!!
Check it out and make up your own mind...

fish oil (fisholene?) is the go,

yes it smells.

The old fisholene smells like....well....fish.The ants love it.
I cant remember the name of the stuff I used, it is aussie made and has no smell at all.I bought it at Super Cheap Auto.

My last 4x4 I coated the whole undercarage in bitumas paint,
took ages,couldnt get a paint brush into hard spots(between springs etc)and had more of the sticky sh!t on me than the car....and it didnt do the job very well.

The spray on airesol fish oil is like sprying WD40 on a nut and bolt,,it seems to suck into it.So far its the best out of all the stuff I have tried.

The eternal battle of metal and rust.......the environment will eventually win
but you can slow it down