The seals under the doors in my car failed a while ago, and there are rust spots and a few holes on the underside of the door. I bought the POR 15 super starter kit to apply to the rust, but I'm not sure what to use to fill up the holes so water doesn't get inside the door. Would JB weld or something similar be a good filler to close the holes underneath the door, after the loose rust is scraped off, and the POR 15 is applied? New door panels without rust would be a permanent fix, I just want to stop the rust that's there.

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1980 240d
1999 SL500

Don't bother patching them, just think of them as additional drain holes.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Yeah, remember the drain holes are there to allow any excessive moisture and water to drain from the door at the bottom. Seal them and your doors will become water tanks!

and if you seal those holes on just one side of your car.....then your car will start leaning in that direction when the water tanks fill up.

Leave the holes open.

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more