Fed up with steel cars !

[Bumpa]

In October 2018 I removed the Z3's outer sills, cleaned up the rust, treated with Fertan and then slapped on Dinitrol underbody seal. Was idling looking under the car today try and see whether I need a set of Mazza's tank straps and the sill looks just as bad as ever.

What products can I use to make it last more than a year and a half?
This was October 2018

This is May 2020

Grrr.
Mike

 

[colb]

If your going to have another go I would clean to bright metal, treat with a rust convertor then paint with galvanizing paint followed by a final coat of a rust prevention underseal product. Looks like the Dinitrol got washed away, maybe it didn't have enough of a key on the surface to get a long lasting grip. When I had my sills off I had no rust so just ensured it was clean and clear waxoyle was applied. Car never used in the winter so not had them off again to check condition.

 

[Brian4]

In October 2018 I removed the Z3's outer sills, cleaned up the rust, treated with Fertan and then slapped on Dinitrol underbody seal. Was idling looking under the car today try and see whether I need a set of Mazza's tank straps and the sill looks just as bad as ever.

What products can I use to make it last more than a year and a half?View attachment 141787
This was October 2018
View attachment 141789
This is May 2020

Grrr.
Mike

Good video here on repairs .

https://zroadster.org/threads/what-to-look-for-video-of-rust-repair.36557/#post-575265

 

[gookah]

I am old school and use Kurust, Hammerite and Waxoyl,
all these new- fangled snake-oil treatments such as POR15 and now Fertan? seem to be sh***.

Rust has been around for years and so have my above 3 treatments.
I wonder if POR15 etc will be around in 20 years.

 

[DrWong]

I used Bilt Hamber to get back to bright steel, then epoxy mastic to seal it, followed by colour coat. Did 18mths ago and still looks fine

 

[Bumpa]

Which Bilt Hamber product did you use? And do you have a brand name for the epoxy mastic please? I have read that Bilt Hamber products are very good.

 

[DrWong]

You read right, they’re very good indeed. I used Bilt Hamber Deox Gel and Lechlar 29107 epoxy primer.

The Deox takes a long time though. I prob spent two or three weeks just applying, cleaning off and then reapplying the gel til all the rust was gone.

 

[Mario]

I can also recommend Deox but also this other product they have Electrox which is a galvanizing primer, then over coat with chassis black stone chip or any other protective paint

 

[Bumpa]

Thank you for your suggestions. I think I will get the Deox gel and I already have on the shelf International Interprotect epoxy primer, left over from when I painted a fibreglass Elan. There's a nice lockdown job!

 

[DrWong]

It’s a perfect job for lockdown really, given the widespread travel restrictions means its no real loss having car off the road for a while

I would’ve done some more bits in recent weeks, but couldn’t find anywhere selling a properly rated A2P3 mask, as my previous one had expired. Everyone is out of stock for obvious reasons

 

[Nodzed]

It’s a perfect job for lockdown really, given the widespread travel restrictions means its no real loss having car off the road for a while

I would’ve done some more bits in recent weeks, but couldn’t find anywhere selling a properly rated A2P3 mask, as my previous one had expired. Everyone is out of stock for obvious reasons

Your date expired mask will be absolutely fine to use. Trust me.

 

[DrWong]

Your date expired mask will be absolutely fine to use. Trust me.

Cheers mate, but wasn’t really referring to a date - it was a 28 day 3M disposable that I’d used for 18mths on all sorts of jobs, not just car paint. Stored in the bag between uses, but started to get a slight whiff of epoxy so binned it

 

[stephen rogers]

por15 is brilliant stuff .

 

[gookah]

por15 is brilliant stuff .

not according to all these users:

https://zroadster.org/threads/underseal-professional-treatments.32163/page-2#post-571601

https://zroadster.org/threads/the-sill-thing-again.26868/page-2

https://zroadster.org/threads/new-sills-wings-paint-protection.26722/

 

[Bumpa]

I've tried POR-15 in the past and didn't like it either.

 

[Nodzed]

por15 is brilliant stuff .

There have been some horror stories with POR-15

 

[stephen rogers]

Really mate,never had a real prob with it myself.

 

[SYMZ3]

View: https://youtu.be/YLAPGqakYXw


These guys look like they know what they are doing. They have a good series of vids on underbody repairs...