Well, here goes. Today's my day to apply some POR-15 to three different cars: minor rust area on wheel well exterior of 91 300D, jack point rust on 87 300D, and wheel well holes on 92 300D (three of them ).

I discovered the wheel well holes when I found I was getting water in the passenger compartment when it rained....but only when the car was moving! Turns out the tires were spinning water through these holes. Took a while to figure out. Otherwise competent indie thought it was probably a windshield leak....so I needless bought a new windshield. But happiness is a new windshield, right? As a temporary measure, I made patches out of duct tape and that kept the water out throughout the winter.

Anyway, the holes are about 2" in diameter. My plan is to get the loose rust off, prep with Marine Clean and Prep & Ready, then apply the POR-15. Then, as the POR-15 is drying, I will make new patches (either of duct tape or the mesh that POR-15 sells), affix them to the drying paint, and then paint over the patch with POR-15.

Hardly a professional job, but should do the trick.

Anyone see any "holes" in my plan? I don't expect the approval of the purists!

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife