Is rustproofing a good thing?

[dhopkins]

I just noticed that my 1970 911T which I recently purchased has what appears to be plastic plugs in the doors. I assume
these are from rustproofing the car at some point. Is this a good thing or a bad thing? I have heard of rustproofing trapping
water and actually fostering rust. There is no paperwork showing that rustproofing was done and the PO did not mention it, though
the car is 100% rust free. Just checking.

[Rick Cabell]

That method of rust proofing put Zeibart, Rusty Jones, Tuff Cote, and more out of business. where the hole was drilled, it broken the paint for moisture to get in and start the rusting process. The hole would start the size of a marble, and then to basketball size.
I was in Switzerland about 10 years ago looking at a 71 T Targa with 16K miles on it. I saw those plugs all over the car and ran away.

[dhopkins]

Thanks for the info but the holes look fine with no paint chips and as I said car is 100% rust free. BTW, Ziebart is still in business.

[Rick Cabell]

Every one in the Northeast is gone. Anyway, if it is in great shape, I would consider it. The drilled holes would bug me. If you are OK with it, then it's not a problem.

[mac73s]

My 70-S was Ziebarted when new (have the records) and it too seemed to have done its job. As for the plastic plugs, no issues around them as well but during the full restoration I am doing I will be removing them and and welding in steel plugs for cosmetic reasons

[Cal]

My low mileage '74 914 2.0L has had the Ziebart treatment and has the plugs.....I've been lucky and haven't had any rust.

[Rick Cabell]

What state do you , or the car live in?

[Cal]

What state do you , or the car live in?

I'm assuming your asking me this question.....I live in PA and purchased the car from Minneapolis. The car was originally from the Denver area.

[dhopkins]

My plugs are different. They are black and have no writing on them. I am the third
owner and the second owner was from Wisconsin.

Don H

[Fixer]

When one does paint-less dent removal, you need to plug the access hole afterward. When removing door dings the pros
drill small access holes rather than remove the door card because it's faster and they lever against the door frame at the opening
to slowly work the ding out. They are usually in a convenient location for a human to kneel and directly in line with the ding.

Probably the plugs you're seeing were for this. But if you're still curious pull the door card and let us know.