Next step for windshield rust repair

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PostPosted: Mon Dec 04, 2023 11:38 pm
Hey guys,

Thank you for accepting me into the forum. I’m currently getting some rust repair in the windshield channel done on my 1992 Mazda Miata. The rust had started to migrate to the A pillar so I took it to a local auto body shop and they cut the rusted portion out and welded in some new metal. The entire windshield frame got repainted but they also painted the window channel. I’m kinda concerned that the new windshield won’t bond to the body very well because there are also some bits of urethane left in the channel in addition to the fresh paint being there. Should I take the car home so that I can take the channel down to bare metal and then apply windshield primer or what should be my next move?

Thank you so much



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PostPosted: Tue Dec 05, 2023 12:10 am
Here is a picture if it helps
https://imgtr.ee/images/2023/12/05/3a495536acd60d661eeeb60a470884e9.jpeg

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PostPosted: Tue Dec 05, 2023 12:24 am
Do not take it down to bare metal, painting the channel in the norm.

After the paint has cured, use a sponge brush applicator of sort and spread the windshield primer all around the channel. That ensures the urethane sealant will bond in the channel.

You're ok !!



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PostPosted: Tue Dec 05, 2023 12:42 am
deez28 wrote:Do not take it down to bare metal, painting the channel in the norm.

After the paint has cured, use a sponge brush applicator of sort and spread the windshield primer all around the channel. That ensures the urethane sealant will bond in the channel.

You're ok !!


That’s a relief. Thank you. So I should have it primered and the glass dropped in about ~30 days when its fully cured?

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PostPosted: Tue Dec 05, 2023 9:26 am
Another option is to use a gray Scotchbrite pad and lightly sand the surface of the window channel. This will apply some scratches for the sealer to adhere to.

Not sure what paint you are using but 30 days seems like a long time for it to cure. Did you check the tech sheet?
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PostPosted: Tue Dec 05, 2023 9:29 am
burritosupreme wrote:Hey guys,

The entire windshield frame got repainted but they also painted the window channel. I’m kinda concerned that the new windshield won’t bond to the body very well because there are also some bits of urethane left in the channel


So they painted over the old left over Urethane without removing it before paint?


Not how I would do it.
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PostPosted: Tue Dec 05, 2023 11:00 am
Let's back up, I over looked you stating they left old urethane in the channel.

If channel is completely covered, then yeah you'll need to remove and clean it up. The substrate needs to be adhesive free for the new (3m windshield) primer and urethane. I'd go back to the body shop and see how they want to handle it. You don't want to ruin the paint beyond the channel trying to remove.

If its just a small spec here and there, then as "68 coronet" said, you'll want to lightly scuff the channel anyway and you'll most likely be able to scuff it away w/o further damage.

Btw, there's a special windshield primer used, it's not just primer. I've installed several and have always used 3m single step windshield primer. Not cheap for the small bottle you'll get that's for sure. The urethane also, isn't just some clear urethane from your local home supply store. It's super thick and you'll need a battery powered dispense gun or the strength of a gorilla if you try a regular gun.

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