need some odvice on undercoating

[omkar]

hi guys.

just started restoring a bmw oldtimer last weekend. currently im stripping the underseal around the places i need to repair in order to do my welding.

i bought a bituminous based underseal to do my touch up work with when im finished. while im stripping the old underseal, i see there is a white coating under the black underseal.

can anybody tell me what this coating might be, its purpose and wether i need to use this when i redoing the underseal. (i thought the bituminous underseal was applied directly to the metal)

i know nothing about restoration and so am learning everything as i go along so any advice would be greatly appreciated.

thanks guys.

 

[pedrobedro]

It might be body schutz, like a rubbery coating or plastic. Bitumous underseal is not good stuff to put on bare metal as water gets behind it and rusts before you get to see what's happening. Schutz stops chips in the underseal or paint from exposing the steel to the atmosphere.

 

[steveo3002]

you dont want to apply it straight to bare metal

idealy epoxy primer , if not some zinc primer or something

 

[omkar]

well consequently i also picked up some anti stone chip primer with the underseal. although, i was planning to use the primer in the boot.

but can i apply the bitumen over the anti chip??

another question---


i have some rust to remove in the boot and thought the anti stone chip would be good to use there.

can anyone tell me a good procedure to go about painting the boot.....

my plan is to: 1st- wire brush the rust off

2nd- wipe down with thinner to get any grease and dust off

3rd- apply the anti chip

4th- paint.

does this sound good??


currently the boot has a flat black paint coating. but, the anti chip is for the rusted areas only.
but would the anti chip react with the other paint??

 

[steveo3002]

idealy the anti chip needs to go over primer ...aerosol etch or zinc 182 from halfords will do , or epoxy if you can stretch to it

 

[omkar]

rust removal advice needed...

hi guys.....

working on the rear of the bmw. working inside the two rear wheel arches and the trunk.......so i decided to dis assemble the rear chassis setup to do my mechanical repairs outside the car rather than under it and it gives me more play room......

the components of the wheels and braking system are pretty rusted and im doing some research on how to remove the rust. checkin out all the info on this site on the subject.

but info doesent relate to a specific task of rust removal.....so i dont know which would be more appropriate for use on the braking system......

i purchaced some chemical rust remover for use on the plate material.
im leaning toward the electrolite dip as this would guarantee a more complete cleaning as compared to wirebrushing.......however, im not sure which method will be appropriate for cleaning the braking system and ALL its small components........because of the fact that after the rust removal i cant repaint some of the components. thinking of just using oil over them when they are clean........

would appreciate any advice and suggestions on a method i can use to treat the fine/ working parts of the braking system


thanks guys for any advice .

 

[the snooper]

oil and brakes dont you want to stop

 

[brightspark]

oil and brakes dont you want to stop

at least they wont snatch

 

[omkar]

im not planning to put oil on the pads and rotor.....

but i want to protect the parts against re-rusting after stripping.

 

[eddie49]

Vinegar ( Dutch: azijn ) works well as a rust remover. Just buy a bottle of the cheapest stuff in the supermaket, drop the parts in, wait a few hours or a few days ( depending on how severe the rust is ). Then scrub with a brush and hot water, dry quickly, and oil or paint immediately to prevent reappearance of the rust.

 

[omkar]

thanks for the info eddie.
im back in holland for the holidays ( i live in belgium. the car lives by my inlaws in holland). so im going to try my chemical, electrolite and vinegar rust removal methods and see which results work for me.

just tried starting an album for my pics, but i'll make it in afew days. i'll post the pics there as soon as i make it.

thanks guys

 

[Will1983]

let us all know the results of your rust removing attempts omkar
im doing a similar project to you at the moment so would be interested to see the difference in performance of the various techniques.