rust treatment on unreachable welds

[Lil Lulu]

I'm about to start patching cut-out rust areas. I need to find a way to rust treat the unreachable back sides of these pieces. These are my main areas of concern.

In each case there will be some area that cannot be reached to rust treat after the pieces are welded in. I'm a big Ospho fan and I plan to spray into all the rocker channels followed by sticky bar oil after the painting is done.

I know about weld-through primer but I also know that you can't really weld through it. I'm also a big MasterSeries fan and I plan to use it on the floor portions.

The last two of the hatch sides I'm unclear how to proceed.

Just need a little direction. Most of the exterior finish is now removed but I had to leave it out in rain for a few days while I worked on the shop.

Any help will be greatly appreciated. I've actually done quite a bit of patching on other vehicles on which I could reach both sides. If life didn't get in the way, everything would be done by now, huh?
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'65 Beetle "Lil' Lulu"- Ruby Red
1600 stock from '71 bus

'72 Deluxe - Niagara Blue w/pastelwiess Camper Special 2L dual 40 Webers 002

'74 Hightop Weekender "Dixie" 1800 34 Del singles

[Mike Fisher]

I would brush on master series silver or black on the chassis and inner fenders. Wire wheel a section and get it painted and patched!
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https://imgur.com/user/FisherSquareback/posts
69 FI/AT square Daily Driver
66 sunroof,67,70,71,71,71AT,72,72AT,73 Parts
two 57 oval ragtops sold
'68 Karmann Ghia sold

Society is like stew. If you don't keep it stirred up you end up with a lot of scum on the top! - Russ_Wolfe/Edward Abbey

[viiking]

Welding destroys any paint be it MS, POR or weld through primer.

Once you do all you can to treat and paint the rust and weld HAZ, spray on lanolin. It creeps into crevices and keeps the rust at bay.

Don't believe me? Just google it.
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1968 1500 RHD Lotus White Beetle since birth. In the hospital for major surgery
1966 Lancia Flavia Pininfarina Coupe - in the waiting room
Discharged: 1983 Vanagon, 1974 1800 Microbus,1968 Low Light,1968 Type 3

[67ctbug]

Why can't you weld through the welding primer? I do it all of the time.
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'67 Beetle L41
'74 Westfalia
'69 Plymouth "Adam-12"
'63 Ragtop
'73 914
'72 Dodge Wrecker
Go Cubs!
World Series Champions 2016

[esde]

The good copper colored weld primer by Upol is EXCELLENT. And for the blind channels, I like this stuff
https://www.eastwood.com/eastwood-internal-frame-coating-14oz-aerosol.html
If you've never looked into cavity wax, thats another good treatment for inside corners and seams.
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.

[67ctbug]

Yes copper weld primer is my choice too. I use SEM but have had fantastic results from other UPol products.
_________________
'67 Beetle L41
'74 Westfalia
'69 Plymouth "Adam-12"
'63 Ragtop
'73 914
'72 Dodge Wrecker
Go Cubs!
World Series Champions 2016

[Lil Lulu]

Esde- how many cans of the Eastwood stuff does it take for the rocker channels?

67ctbug- I understand that you can weld through the primer but any rust prevention or priming on the welds must be lost in the process. No?

Thank you both.
_________________
'65 Beetle "Lil' Lulu"- Ruby Red
1600 stock from '71 bus

'72 Deluxe - Niagara Blue w/pastelwiess Camper Special 2L dual 40 Webers 002

'74 Hightop Weekender "Dixie" 1800 34 Del singles

[67ctbug]

[Braukuche]

Ospho only attacks the very top layer of rust. A better product are the jelly based rust removers that sit and soak in a bit more. Rustoleum sells a very good product but even then to get the rust out of pitted metal takes multiple applications and abrasive removal to get down to the bottom layers. It’s a PITA. I spent a full week on Ghia doors, five applications with heavy pitting until I finally hit shiny metal at the bottom of the pits.
In blind cavities you remove what you can get to and then spray in Waxyoyl or some other such stuff to try and encapsulate and keep moisture out. The best thing to do after that is keep it out of the wet and humid environment which will soon activate and rust you miss, which on a rusty bus will be lots of spots.
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Go Reds! Smash state!

Retirement is here!
1956 Ghia
1959 SO-23 Westfalia
1960 double cab
1960 Baja Bug
1963 stretched double cab
1962 Golde sunroof Ghia
1963 356 B coupe
1963 Notchback
1967 21 window less rusty now

[VW_Jimbo]

I would say Lanolin spray as well. Easy to get and apply.

Here is a WD40 version video of it.

Link


Or this. You can get it off Amazon. Lasts for 2 years.

Link

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Jimbo

There is never enough time to do it right the first time, but all the time necessary the second time!

[esde]

[Lil Lulu]

Two it is then . Thanks
_________________
'65 Beetle "Lil' Lulu"- Ruby Red
1600 stock from '71 bus

'72 Deluxe - Niagara Blue w/pastelwiess Camper Special 2L dual 40 Webers 002

'74 Hightop Weekender "Dixie" 1800 34 Del singles

[Lil Lulu]

I’m also concerned about how to kill the rust in the body seams. I’ve seen too many nice paint jobs then start blooming from the seams in a year or two. Some claim that Ospho will soak into the seams. I have done no experiments to test the theory. I’ve seen quite a bit of claims and theories including here, concerning phosphorus compounds but none that I consider definitive.
_________________
'65 Beetle "Lil' Lulu"- Ruby Red
1600 stock from '71 bus

'72 Deluxe - Niagara Blue w/pastelwiess Camper Special 2L dual 40 Webers 002

'74 Hightop Weekender "Dixie" 1800 34 Del singles