Rust Bubbles - My Car Rust Part 1

Robs72T · 02-02-2008, 05:30 AM

I have some rust bubbles under my paint that I have marked with a red grease marker. The part that concerns me is that the "bubbles" seem to be following a line. If I feel under them I can feel a metal lip that seems to have raised.

Have you seen this before, what is the fix (can I cut them out and repair the metal (with new metal) and if so will I have more problems with rust running under that metal lip (inner fender), does the whole panel need to be removed and reattached?).....

Thanks.

Fritz Peyerl · 02-02-2008, 05:41 AM

did you check from under the fender, how it looks. Could it be a bad fender replacement job and not proper sealed .

Fritz

Neilk · 02-02-2008, 06:54 AM

Looks like dirt is stuck between the fender and the tube for the rear decklid release latch. When it gets wet, rust will eventually develop.

Oops disregard, reread your post about the line in the fender....

Robs72T · 02-02-2008, 08:23 AM

Here are more pics. under the fender of the metal band/lip lift

I have put quarters under the gap

ossiblue · 02-02-2008, 08:54 AM

Looks like Fritz nailed it. It appears to be a replacement that was lap welded and improperly sealed--moisture shooting up into the gaps from the tires.

Fritz Peyerl · 02-02-2008, 10:04 AM

I had 3 blisters on my 911T, when I ground down the bondo, I found holes in fender. When I searched under fender, I found small batches tack welded to underside as filler material and than the rest was filled with bondo. No effort was made to seal the gap between the filler piece and fender.
The a..hole body shop screwed the PO.

Best thing to fix this is to cut the fender and support piece with a cutting wheel and bud weld those together, if you have healthy metal at cut line or you remove rear quarter panel complete and replace whole quarter panel.

Fritz

Bobboloo · Bobboloo's Garage

If your ready to make the repair then get an angle grinder with a wire brush wheel and remove the paint and filler from the top of the quarter panel all the way along the lap weld line. Then you can access the level of damage and take it from there.

Depending on the outcome you can decide whether to spot repair and seal or whether to remove the lap welded pnanel and start over.

Should you remove the lap welded panel take the opportunity to wire brush the rust and any cracked undercoating on the underside of the flange at the top of the quarter panel. It's rusted there from undercoating flaking off. When your done making your repairs you can paint and re-undercoat.