Protecting new parts from rust
 

I'm putting new parts on the underside of my car and I'm looking for advice/ideas on how to protect & rustproof them before they're bolted back on.

New parts include rear subframe, trailing arms, upper & lower arms, brake backplates, discs, hubs, rollbar, etc.

The factory paint on these items isn't the best so I don't know whether to just put more paint on top of the existing paint (after keying it) and then apply wax over the top of that.

Or ...

Strip all the existing paint off (sandblast?) and repaint with primer and top coats, then apply wax on top. This is obviously a very expensive route to take.

Any suggestions?

Have you seen this thread?

https://the75andztclub.co.uk/forum/s...d.php?t=297932

Only after typing mine. :}

Firstly I would take all the new parts and get them blasted, zinc primed, and wet finished in proper paint.

Secondly, use some 3M cavity wax on the insides of the subframe and suspension arms.

Thirdly, use Dynax-UB for under the car and spray anything you dont want to corrode.

I even got my new made in India fuel tank strap re-welded (strengthened) and blasted and painted properly.

Will probably outlast me.

I wouldnt have a clue where to get things blasted but I did strip mine back then 2-3 coats of red oxide then 2 Hammerite. If I ever need to fit them a rustproofing agent inside and out over the top. Best I could do lol!

Thanks for the advice everyone.

I'm read so many options & opinions on this forum and in others that my brain hurts - so I still can't decide what to do. :o

Logic says sandblast, then galvanise, then paint (primer & top coats) and finally wax. But my wallet says ":eek:" about the sandblasting stage - it's likely to be several hundred quid to do this little lot (line 2 post 1). So decision number 1 is whether to sandblast or not.

Decision number 2 is which products to use. The list is endless but Bilt Hamber and POR-15 seem to get a lot of recommendations. I contacted POR Support and they said don't galvanise*- go straight from sandblasting to the priming stage. So that confuses things even more. :shrug: https://porproducts.com/our-brand.


Edit Just to add to the above: i.e. sandblast or don't sandblast. POR Support said either way will work. Using POR-15 over factory painted new parts will extend the life of the paint, but POR-15 on sandblasted parts is a permanent solution.

Edit *The reason being (say POR) that there's no advantage over using the POR 3-step system.

Definately dont rely on hammerite for protection, its not the waterproofer/external paint that it once was, despite appearing quite gloopy. My new subframe/arms were painted over with 2 coats and there's definately rust appearing after just a few months!! (should have used wax too :duh: )

I've read that in several places now so I won't rely on Hammerite - I'll be using something else. POR-15 is the most likely candidate at the moment.
It's very expensive though.

A slightly different take to sandblasting.

How about stripping down with something like this:

https://www.stripperspaintremovers.c...ct/solvistrip/

Then something like one of these to prep & convert any rust:

https://aquasteel.co.uk/

https://www.bilthamber.com/paints-an...ngs/hydrate-80

Then coat with the finish of your choice.

Good luck.

Andy.

Good idea if it works - have you tried it yourself?