Undersealing, tips/hints/avoids

Russ

Russ

Club Member
Hi,

OK my MOT guy who saw the underside of my car last year and again this year thinks that I should underseal it before anything gets going on it.

He's very kindly leant me his ramp on a Saturday as well to do it he was that keen I don't get rust in :thumbs:

I know the basic idea, and have assisted in doing some other classics, but what I'm most interested in is how do I do the underside of my 300 without it ending up looking like I drove it into a tar pit or something? Do I need to avoid any particular areas, or just generally try to give everything a reasonable coat and get some sprayed in the sills?

I know he'll be of the "just stick more on" mentality, and I know no one looks under your car, but it's bloody clean at the moment and I don't want to just cover it and every time I'm under the car think "that looks horrible" :)

Cheers
 
Russ were u thonking of brushing it on or using underbody schultz applied with a air fed schultz gun ?
 
I was considering both, but really whichever does the neatest job. I don't mind if it takes ages, I've seen the underside of so many old cars caked in it I really want to avoid it :)
 
well in that case then i suggest you mask off all the non body parts or remove if you can ie brake /fuel lines then use the gun method but heat the product up to about 60 degrees so its like milk then spray it on ,try on a scrap pannel first as you will see what a fine smooth texture it leaves
 
Ahh top tip thank you!

I'll go try and get my car weighed first as I've been meaning to, then get it up on the ramp and figure out what I have to do. I wanted to avoid taking it all apart (didn't really think of that one!) so I'll see what's involved and where it looks like I should be doing it first :)
 
Can't stand the stuff myself Russ, I think it looks horrible and weighs a ton!
However there might be a case for spraying on some of the smooth stone chip(spray tin) on areas that are suffering ( lower rear arches etc). You can then paint over that and still make it look nice. As for your sills and chassis rails apart from areas that are missing paint, they rust from the inside out! The only think that will stop that is hot waxoil squirted in on a warm summers day. Just my opinion mate.
 
The more I think about it the more I'm put off with waxing it all now lol.

I think I need to get it in the air and see what I think, I've got plenty of things to do without creating a new job. Maybe i'll just reapply some smooth stone chip to the problem areas, do the inside of the sills properly and go from there.

Really I planned to smooth all the lower parts of the car and have my sills straightened (muppets with jacks) and have the whole car below the body line resprayed. Maybe I should combine the two and do it properly.

Good idea on waiting for a warm day as well :)
 
are you sure he meant undersealing and not wax oiling as would have thought it just wants wax oiling.fairly simple job ,a bit messy but effective ,in black,clear or amber which is proberly best as you can still see everything when coated.
 
stone chipped mine and then painted. Mind you it was etched with a really good primer. All voids waxoiled.
 
I'm a fan of wax oiling but it needs redone fairly regularly particularly if the car gets used alot. Any sort of bituminous underseal is too thick and too heavy and will eventually dry out and crack. Once it cracks and water and salt gets in you've got worse probs than before. Good idea to wax oil the cavaties inside aswell, round the lower parts of the wheel arches and inner and outer sills. 300's seem to be prone to rust from the inside at the front of the rear wheel arches and the rear ends of the sills. 'course this is all IMHO and others may feel differently on the subject.
 
Thanks for more ideas.

Datty, you're right about the rust, I think that's where the targas drain to (into the rear of the sills). Thankfully I don't have targas so can avoid that problem area :)

Just moved to my new place so doing car jobs is completely out the window for a bit, doh!
 
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