Underbody clean up - 2021 recommendations

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MiniMan
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Underbody clean up - 2021 recommendations

Post by MiniMan » Sun Feb 14, 2021 4:47 pm

Hi all,

Firstly thank you for all your help last week with the removal of a stubborn leaf spring. The 9" angle grinder worked a treat, if not a little scary.

Now everything is off the rear (leaf springs, diff and fuel tank) I wanted to take the opportunity to clean it all up. Since I've owned the car it's been covered in waxoyl. I've began the lengthy process of removing this using white spirit, a wire brush and plenty of paper towels.

Once clean does anyone have any recommendations what to do next... My original plan was to stonechip all the underside, including the wheel arches and then coat in clear film dynax https://www.elitecarcare.co.uk/product/ ... wax-750ml/ .. frost paints do a white stone chip so this would be perfect for the wheel arches https://www.frost.co.uk/extreme-paint-o ... hite-1ltr/ with the clear film dynax over the top...but I'm still not sure... there is also little patches of service rust that I was planning to treat using a product like kurust.

I'm not a huge fan of waxoyl but Iwould like to hear everyone's thoughts. I realise new products are coming out every week... so I know this area of protection is constantly evolving.

Thanks as always
Sam
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Jasonmarie
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Re: Underbody clean up - 2021 recommendations

Post by Jasonmarie » Mon Feb 15, 2021 12:35 am

A great question my Capri was treated in Dintrol from new and I top up every 5 years . Reading in many classic car magazines this always comes out top . I spoke to the original owner a few years back and his first words was “ I knew Dintrol would be worth the money as its expensive but well worth the money “

Here’s the web site https://www.dinitroldirect.com/?utm_sou ... 7UQAvD_BwE
Ford Capri 2.0 Laser 1987 Mercury Grey ....... :beer:

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Re: Underbody clean up - 2021 recommendations

Post by pbar » Mon Feb 15, 2021 11:27 am

MiniMan wrote:
Sun Feb 14, 2021 4:47 pm
Once clean does anyone have any recommendations what to do next.

Depends on your objective really, are you wanting it to look mint for shows, etc. or more concerned about being practical, using something you can keep on top of over the years and keep the car protected. My mindset is more the latter, I favour Hammerite Under Body Seal, it is easy and quick to apply and keep the car topped up and I trust the brand (Hammerite)

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Also, I wouldn't rule out simply painting (either brush on or spray) the underside first with a standard (any colour you wish but I prefer the normal satin black) Hammerite paints, that stuff is incredibly protective, I mean, it is used on bare metal gates and railings isn't it, which are out in all weathers and protects those for years.

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Re: Underbody clean up - 2021 recommendations

Post by Bug » Mon Feb 15, 2021 12:45 pm

I am not such a fan of the paint on Waxoyl as it always seemed to go harder and then be liable to crack and let moisture in under it.
The same would possibly apply to Hammerite. Garden railings don't tend to flex like the body of a car would, so may give a slightly false impression.
Everyone will have their own thoughts obviously, but my preferred option, employed successfully on many cars since 1983 has been to use the spray on Waxoyl. I used to dilute some of it a little with white spirit and spray it into all the nooks and crannies. Being a bit thinner it would aid its natural capillary action and creep as far up the joins as possible. Then I'd go back over the whole car again, with undiluted Waxoyl spray. I used to repeat this process every 3 years or so and never had any issues.
I would recommend though that you wait for the hottest day possible, park the car on polythene sheets (or somebody else's drive ;) ), then take it for a drive down the dustiest road you can find. And after all that you will still get drips for a week or two.

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Re: Underbody clean up - 2021 recommendations

Post by andyd » Mon Feb 15, 2021 1:56 pm

I had clear Waxoyl spray on my Sierra a few years ago.

I have heard Dinitrol is good but no experience of it!

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Re: Underbody clean up - 2021 recommendations

Post by Mc Tool » Mon Feb 15, 2021 6:56 pm

Fisholine works good too
Screenshot_20210216-075503.png
Id rather have a bottle in front of me :beer: than a frontal lobotomy 🤯

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Re: Underbody clean up - 2021 recommendations

Post by Bug » Tue Feb 16, 2021 8:02 am

Mc Tool wrote:
Mon Feb 15, 2021 6:56 pm
Fisholine works good too
Screenshot_20210216-075503.png
Oh for Cod's sake man! you haddock me going there for a minute!
Maybe we should all line up and conger down to the local auto store for some. In fact there's a decent bloke with a shop near me. Eel take of the VAT, so we only pay the net value.
Anyway, enough hilarity for now. I know my plaice. :D

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Re: Underbody clean up - 2021 recommendations

Post by mjcapri » Tue Feb 16, 2021 8:45 am

Bug wrote:
Mon Feb 15, 2021 12:45 pm
I am not such a fan of the paint on Waxoyl as it always seemed to go harder and then be liable to crack and let moisture in under it.
The same would possibly apply to Hammerite. Garden railings don't tend to flex like the body of a car would, so may give a slightly false impression.
Everyone will have their own thoughts obviously, but my preferred option, employed successfully on many cars since 1983 has been to use the spray on Waxoyl. I used to dilute some of it a little with white spirit and spray it into all the nooks and crannies. Being a bit thinner it would aid its natural capillary action and creep as far up the joins as possible. Then I'd go back over the whole car again, with undiluted Waxoyl spray. I used to repeat this process every 3 years or so and never had any issues.
I would recommend though that you wait for the hottest day possible, park the car on polythene sheets (or somebody else's drive ;) ), then take it for a drive down the dustiest road you can find. And after all that you will still get drips for a week or two.
I’ve got to say I agree with you here. Hammerite belongs on gates and railings (at a push!) certainly not on cars. When it fails (which it will) it needs to be completely removed as it isn’t over-paintable which only adds to my dislike of it. Each to their own but I’m speaking from experience here....

The Waxoyl suggestion is a good practical solution, as you say you just need to top it up every so often (and avoid steam cleaning!).

As the OP has said there are loads of products out there these days and some of them are excellent (I really like Bilt Hamber stuff) but the problem is you need to start from scratch to get the benefit of them. In this case I’d probably stick with the original plan but look at using Bilt Hamber products (Deox GEL and Electrox) to clean and protect the rusty bits before going over with the stone chip. There’s some good info here: https://www.detailingworld.co.uk/forum/ ... p?t=276896 and on the Bilt Hamber website obviously.

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Re: Underbody clean up - 2021 recommendations

Post by pbar » Tue Feb 16, 2021 12:21 pm

Bug wrote:
Mon Feb 15, 2021 12:45 pm
Garden railings don't tend to flex
Hi Martin, hope you're keeping well. Garden gates do flex/spring quite a bit, especially larger ones and/or those made with thinner material. Certainly, double gates I used to have at one point sprung and flexed quite a bit. A neighbour has a single gate covering his drive, and you can see the movement and twist in that as the Herculean postman boings it open, it's like a giant tuning fork. Railings expand/contract in weather extremes too obviously, it can be a nightmare if thinner material is used as you think you have a nice snug fit, then you have a look some weeks later when the weather has changed and gaps have appeared due to weather and temperature changes.

I maintain that Hammerite paint gives an excellent protection, I've made and welded garden ornaments, just for fun and practice, using bare steel and those have been out in all weathers permanently, just with quick brush on Hammerite standard paint, no sign of any corrosion on any of the metal or welds. Gives a lovely smooth finish too, it was a good experiment actually.

Thanks for your response Martin, I always value your opinions.
Last edited by pbar on Tue Feb 16, 2021 12:35 pm, edited 1 time in total.

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Re: Underbody clean up - 2021 recommendations

Post by pbar » Tue Feb 16, 2021 12:22 pm

Bug wrote:
Tue Feb 16, 2021 8:02 am
Oh for Cod's sake man! you haddock me going there for a minute!

You ain't got no sole, brother!

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Re: Underbody clean up - 2021 recommendations

Post by Bug » Tue Feb 16, 2021 1:58 pm

pbar wrote:
Tue Feb 16, 2021 12:21 pm
Bug wrote:
Mon Feb 15, 2021 12:45 pm
Garden railings don't tend to flex
Hi Martin, hope you're keeping well. Garden gates do flex/spring quite a bit, especially larger ones and/or those made with thinner material. Certainly, double gates I used to have at one point sprung and flexed quite a bit. A neighbour has a single gate covering his drive, and you can see the movement and twist in that as the Herculean postman boings it open, it's like a giant tuning fork. Railings expand/contract in weather extremes too obviously, it can be a nightmare if thinner material is used as you think you have a nice snug fit, then you have a look some weeks later when the weather has changed and gaps have appeared due to weather and temperature changes.

I maintain that Hammerite paint gives an excellent protection, I've made and welded garden ornaments, just for fun and practice, using bare steel and those have been out in all weathers permanently, just with quick brush on Hammerite standard paint, no sign of any corrosion on any of the metal or welds. Gives a lovely smooth finish too, it was a good experiment actually.

Thanks for your response Martin, I always value your opinions.
Yup, I re-read my post and it did sound like a dig. Sorry, wasn't the intention. Probably not a good analogy in hindsight.
I too, have used hammerite and smoothrite in vast quantities over the years. In fact, I have a bright yellow pair of brake calipers hardening under the hall radiator as I type, ready to go on wifey's Z4 at the weekend. I still maintain though that, under the car, out of sight, the paint can crack or be chipped, then let moisture in. Waxoil tends to heal itself and even if a small area is exposed, the moisture can't really creep further under it.

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Re: Underbody clean up - 2021 recommendations

Post by Bug » Tue Feb 16, 2021 2:00 pm

pbar wrote:
Tue Feb 16, 2021 12:22 pm
Bug wrote:
Tue Feb 16, 2021 8:02 am
Oh for Cod's sake man! you haddock me going there for a minute!

You ain't got no sole, brother!
Just phishin'

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Re: Underbody clean up - 2021 recommendations

Post by pbar » Tue Feb 16, 2021 2:14 pm

Bug wrote:
Tue Feb 16, 2021 1:58 pm
I too, have used hammerite and smoothrite in vast quantities over the years. In fact, I have a bright yellow pair of brake calipers hardening under the hall radiator as I type

That under-the-radiator spot makes for a good paint booth oven doesn't it :) Lost count of the amount of things I've placed there, and even very recently the radiator behind me right now has been serving that purpose.

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Re: Underbody clean up - 2021 recommendations

Post by mjcapri » Tue Feb 16, 2021 2:35 pm

Bug wrote:
Tue Feb 16, 2021 1:58 pm
pbar wrote:
Tue Feb 16, 2021 12:21 pm
Bug wrote:
Mon Feb 15, 2021 12:45 pm
Garden railings don't tend to flex
Hi Martin, hope you're keeping well. Garden gates do flex/spring quite a bit, especially larger ones and/or those made with thinner material. Certainly, double gates I used to have at one point sprung and flexed quite a bit. A neighbour has a single gate covering his drive, and you can see the movement and twist in that as the Herculean postman boings it open, it's like a giant tuning fork. Railings expand/contract in weather extremes too obviously, it can be a nightmare if thinner material is used as you think you have a nice snug fit, then you have a look some weeks later when the weather has changed and gaps have appeared due to weather and temperature changes.

I maintain that Hammerite paint gives an excellent protection, I've made and welded garden ornaments, just for fun and practice, using bare steel and those have been out in all weathers permanently, just with quick brush on Hammerite standard paint, no sign of any corrosion on any of the metal or welds. Gives a lovely smooth finish too, it was a good experiment actually.

Thanks for your response Martin, I always value your opinions.
Yup, I re-read my post and it did sound like a dig. Sorry, wasn't the intention. Probably not a good analogy in hindsight.
I too, have used hammerite and smoothrite in vast quantities over the years. In fact, I have a bright yellow pair of brake calipers hardening under the hall radiator as I type, ready to go on wifey's Z4 at the weekend. I still maintain though that, under the car, out of sight, the paint can crack or be chipped, then let moisture in. Waxoil tends to heal itself and even if a small area is exposed, the moisture can't really creep further under it.
The main problem with it is that it relies simply on forming a film to seperate the metal from oxygen and moisture, there's nothing 'clever' about it. If you properly prepare a piece of steel/iron, paint it with Hammerite and keep it in an environment where the film isn't compromised, for example through impact damage or flexing, it will provide protection. The underside of a vehicle isn't such an environment unfortunately. I've seen countless examples where Hammerite has been used and has been chipped or otherwise damaged and not only has the exposed area corroded but so has the surrounding metal which still appeared to be protected as moisture had got behind the paint. The fact that you then need to remove every last trace of the stuff before repainting with something else is the final kick in the proverbials for me! Even on clean metal an epxoy mastic is infinitely superior in every way, I just see no reason to use Hammerite these days.

As above I'm not having a dig at anybody either, I'm simply stating what I have found works and doesn't work over the years. 8-)

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Re: Underbody clean up - 2021 recommendations

Post by Mc Tool » Tue Feb 16, 2021 7:19 pm

Bug wrote:
Tue Feb 16, 2021 8:02 am
Mc Tool wrote:
Mon Feb 15, 2021 6:56 pm
Fisholine works good too
Screenshot_20210216-075503.png
Oh for Cod's sake man! you haddock me going there for a minute!
Maybe we should all line up and conger down to the local auto store for some. In fact there's a decent bloke with a shop near me. Eel take of the VAT, so we only pay the net value.
Anyway, enough hilarity for now. I know my plaice. :D
You missed a couple 😝
Id rather have a bottle in front of me :beer: than a frontal lobotomy 🤯

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Re: Underbody clean up - 2021 recommendations

Post by MiniMan » Thu Feb 18, 2021 12:38 pm

Hi everyone,

Thanks for all your comments regarding this. I'm still a little unsure what path to go down but appreciate all the advice.
I'll do my best to keep you updated with my progress... once the underside is clean and I can move forward with the next steps :D .

Thanks again
Sam
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