subframe rust how to treat

[Dazza44]

hi all, my car recently had mot and am advisory of slight corrosion on rear underneath I'm assuming it's the sub frame as I can only see rust along that,could any advise best method to sort this,would it be a wire wheel on dremmel?,to rub the rust down,
Also if any one can advise what to you to treat this so hopefully doesn't return.
Many thanks
Darren

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[Dazza44]

hammerite KURST to convert the rust to something solid the waxoyl to prevent it coming back.

[Scartlead]

How bad is it? Stick a pic up to give us an idea, have just done my own.

[Dazza44]

that's generally it.


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[SeeJay]

Wire brush followed by Frost Automotive POR 15 - neutralises rust and gives a glossy black finish

[delta0]

Wire brush followed by Frost Automotive POR 15 - neutralises rust and gives a glossy black finish

Which product does that? Por 15 metal prep? Also can it just be sprayed across the underside of the car?

[SeeJay]

It's usually applied by brush..that's how I've always done it

Yes you can do the undefloor with it,suspension arms,subframes,even sumps..

https://www.frost.co.uk/paints-coating- ... aints.html

[delta0]

It's usually applied by brush..that's how I've always done it

Yes you can do the undefloor with it,suspension arms,subframes,even sumps..

https://www.frost.co.uk/paints-coating- ... aints.html

I was looking at the metal prep on there and it looks like a good starter for getting on top of the rust. It appears to be a rust converter. Should be able to spray that across the underbody and then go from there with further protection.

[SeeJay]

Frost products aren't cheap,but if restorers of valuable,classic concours cars swear by it - and they do - then it's good enough for a bit of Japanese tin

[ChrisHolmes]

Make sure you also spray inside the subframe and any other chassis box sections you can access, especially the sills.

[delta0]

Frost products aren't cheap,but if restorers of valuable,classic concours cars swear by it - and they do - then it's good enough for a bit of Japanese tin

Ordered some Por 15 metal prep. Going to give it a go next weekend.

[Dazza44]

thanks for all the advice, much appreciated

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[dac69er]

are the subframes just bare steel? that rust is worse than my fiat of twice that age!

unless you remove the subframe, whatever you do will only hide the problem or slow it down at best.

[Dazza44]

just ordered tin of frost por15 as recommend by seejay , like he said though isn't cheap

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[AndyBrad]

would an easier way not be to use some acf50?

[qwakers]

acf 50 is not permanant.

[AndyBrad]

nope but itll be a damn sight easier to do than painting and will get into all the nooks and crannies.

[goodeggbob]

hi daz,do you have access to a big compressor?if so you may find this tool useful for shifting flakey rust on heavy items ie subframe and sus arms.just need to be careful around bushes and brake lines.worked a treat on mine and left surfaces ready for paint prep.rob.

[Dazza44]

thanks for the suggestion Rob unfortunately I don't have access , I be realying on good on fashion elbow work

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[AndyBrad]

jesus, id be supprised if there was any car left after using that

[goodeggbob]

hi,you adjust air flow to alter impact.in the right hands you can be very surgical.

[obakemono]

http://www.nortonsandblasting.com/faq-mbx_tool.html
That's much easier on the car than a needle gun, very expensive though

[sztriki]

Is there a place around London/Herts that one would actually trust with treating the underbody of an RX8? I'm kind of considering it as the big project for next year (car's gonna sleep through the winter), there are garages for rent on a daily rate with a lift, I have wire brush for a drill that did a good job cleaning up brake calipers and neither acf50 nor Hammerite Kurust and Underbody Seal are really that expensive...but
1. I doubt I'd be able to cover everything properly and doing it half-arsed might do more damage than good
2. I'm not sure what to do with bolts, nuts, lines, etc, take those apart or just coat them

So if it's not stupid expensive I'd rather leave it to the pros but don't know if it's just any car body shop, if it's a relatively easy and common for garages to do or if there are certain people that come recommended?

[willberry70]

Likewise for rust treatment garages in the Midlands that anyone can recommend.

[ChrisHolmes]

Likewise for rust treatment garages in the Midlands that anyone can recommend.

I am thinking about going to these guys http://krown.co.uk